How Do I Create a Repeatable Fragrance Mixing and Curing Protocol so Every Commercial Batch Performs Like the Approved Test Candle?
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What goes into a candle SOP? Twelve sections: scope, formula card, materials and lots, equipment checks, weighing, melting and temperature, fragrance addition and stirring, pouring, wicking, curing, QC and release, and records with change control. See the template.
What is the most common SOP mistake? Writing "add 8% fragrance" without saying 8% of what. 800 g of oil into 10 kg of wax makes a 10.8 kg batch at 7.41%, not 8%. That is 14.81 g of oil per 200 g candle instead of 16 g. Always state the convention.
What does a 10 kg batch cost? 800 g of Raat Ki Rani and 9,200 g of Luxury Soy Wax Chunks make 50 × 200 g candles. With jars, wicks and stickers the consumables are ₹16,808.00, plus ₹1,357.00 of tools you keep.
Why good test candles become bad batches
Most batch-to-test differences are not mysteries. The test candle was made in a small jug, stirred for as long as it took, poured at once and lit at whatever age was convenient. The production batch is ten times bigger, poured over forty minutes by someone else, and tested at a different age. Each difference is small, and together they make a different candle. A protocol closes those gaps by making the implicit explicit.
| Variable | Test candle, typically | Production batch, typically | Protocol control |
|---|---|---|---|
| Load convention | Oil weighed for one jar | Percentage applied to a wax weight | State the convention; list gram weights per batch size |
| Mixing | Small jug, thorough stir | Large pot, short stir relative to volume | Validated stir time and method; re-stir before fills |
| Pour duration | Seconds | Many minutes; pot cools and stands | Sub-batch size limit; temperature log |
| Temperatures | Whatever the thermometer showed | Varies by operator | Wax maker's figures written into the SOP |
| Cure age at test | Whatever was convenient | Different again | Checkpoint from the cure register; QC at that age |
| Oil and wax lot | One lot | New lots arrive | Lot numbers on the batch sheet; retained samples |
| Operator | You | Your team | Written steps anyone can follow |
Several of those rows have their own guides in this cluster. Mixing time for large batches and keeping a 10 kg batch uniform cover the stir. First and last candles differ covers pour-order effects. Per-scent cure checkpoints and QC across pour days cover cure and testing. This page ties them together into one document.
The formula card
The formula card defines what the candle is. It is one page, versioned, and it changes only through change control. Every field is something that, if it changed, could change the candle. Below is a card filled in for the worked example. The cure checkpoint is an example of what a cure register might show. It is not a CSI figure.
| Field | Value | Note |
|---|---|---|
| Product | Raat Ki Rani, 200 g container candle | One card per product and size |
| Oil | Raat Ki Rani (Night-Blooming Jasmine) Fragrance Oil | Record the lot number on each batch sheet |
| Load and convention | 8% of finished weight · oil = W × L | Never "8% of wax" |
| Per candle | 16 g oil + 184 g wax = 200 g | Fill weight checked on the scale |
| Per 10 kg batch | 800 g oil + 9,200 g wax = 50 candles | Also list 5 kg and 2.5 kg batches |
| Wax | Luxury Soy Wax Chunks (stated maximum 13%) | A wax change is a new formula |
| Wick | Eco Candle Wicks Thin C1, centred | Confirmed by burn test in this jar |
| Jar | White Matte Glass Jar | A jar change is a new formula |
| Temperatures | Per the wax maker's instructions | Write the actual figures from the product page here |
| Stir | Time and method validated by sampled pours | Example: 2 minutes per 2.5 kg sub-batch, a working figure |
| Cure checkpoint | 7 days (example, from cure register) | QC burn at this age |
| Approved by / date | Name, date, reference candle code | Keep reference candles |
The 12-section SOP template
The SOP defines how the candle is made. It refers to the formula card for the numbers and gives the steps in the order they happen. Keep each section short enough to follow with wax on your hands. The template below lists what each section must contain. Copy it, fill it with your own validated figures, and print it for the workbench.
| # | Section | What it must contain |
|---|---|---|
| 1 | Purpose and scope | Which products and formula card versions this SOP covers; who may run it |
| 2 | Formula card reference | Card name and version; instruction to stop if the card and the materials do not match |
| 3 | Materials and lots | Receiving checks; record oil and wax lot numbers; retained oil sample for each new lot; MSDS/IFRA on file |
| 4 | Equipment and checks | Scale checked with a known weight before each session; thermometer checked; clean, dry vessels |
| 5 | Weighing | Load convention stated; gram weights for each batch size; tare procedure; weights written on the batch sheet |
| 6 | Melting and temperature | Wax maker's melt and fragrance-addition figures (for CSI 464, CSI's guidance of 80–90°C, confirmed on the product page); maximum hold time |
| 7 | Fragrance addition and stirring | When and how to add oil; validated stir time and method; scrape sides and base; re-stir before each fill |
| 8 | Pouring | Maximum sub-batch size; pour temperature range; number jars in pour order; log pot temperature at set intervals |
| 9 | Wicking and setting | Wick type, stickers, centring; where candles set; no moving until set |
| 10 | Curing | Curing location and conditions; batch code on each base; checkpoint from the cure register; no release before it |
| 11 | QC and release | Retained candles per batch; QC burn at the checkpoint beside a same-age reference; pass, hold and fail rules; release record |
| 12 | Records and change control | Batch sheet, QC log and cure register kept for a set period; any change to oil, lot, wax, load, wick, jar or process triggers re-validation |
Sections 5 to 8 are where most batch differences start, so write them with numbers, not adjectives. "Stir well" is not an instruction. "Stir for 2 minutes with a long bamboo stirrer, scraping the base, then 20 seconds before each jug fill" is, provided those figures came from your own sampled-pour test. The 2 minutes and 20 seconds here are examples of the form, not recommendations. For temperatures, copy the wax maker's figures from the product page. CSI's only temperature on record is its CSI 464 guidance of 80–90°C, and for Luxury Soy Wax Chunks you should use the maker's own instructions.
The batch sheet
The batch sheet records what actually happened. It is filled in during the batch, not afterwards from memory. When a batch fails QC, this sheet is the only way to find out why. Here is a template with the worked example's target values. The "actual" column is left for the operator, and every blank is something to write down.
| Step | Target | Actual | Initials / time |
|---|---|---|---|
| Batch code | RKR-CH-YYMMDD-session | ||
| Formula card and version | Raat Ki Rani 200 g, v1 | ||
| Oil lot / wax lot | Record both | ||
| Scale check (known weight) | Reads correctly | ||
| Wax weighed | 9,200 g (10 kg batch) or per sub-batch | ||
| Oil weighed | 800 g (10 kg batch) or per sub-batch | ||
| Melt / addition temperature | Wax maker's figures | ||
| Stir time and re-stirs | Validated time; re-stir before each fill | ||
| Pot temperature at first / middle / last fill | Within the wax maker's range | ||
| Candles poured / fill-weight checks | 50 × 200 g; spot-check jars 1, mid, last | ||
| Retained candles | 2 (QC + retained), random positions | ||
| QC date (pour + checkpoint) / result | Pass / hold / fail vs same-age reference | ||
| Released on / by | Only after pass |
The code format follows standardising cure before QC: scent, wax, pour date and session. Keep the sheets together with the QC log and the cure register. Three short documents, the formula card, the SOP and the batch sheet, do more for consistency than any amount of experience held in one person's head.
Validating the protocol
A written SOP is only a hypothesis until one batch made by following it performs like the approved candle. The validation batch is that proof. Run it at your real production size, with the person who will normally run it, following the SOP to the letter.
What the protocol needs
Here is the validation batch from the worked example, priced from CSI's live listings. 50 candles at 200 g and 8% in Luxury Soy Wax Chunks, with White Matte jars and Eco Thin C1 wicks. Material cost per candle is ₹108.38 of Raat Ki Rani at the 1 kg rate plus a ₹186.92 base, which is ₹295.30. That excludes labour, packaging, freight and GST. The batch holds ₹14,765.00 of materials, and every candle that passes is sellable.
| Pack | Price | Per gram | 10 kg batches at 8% (800 g) |
|---|---|---|---|
| 15 g | ₹130.00 | ₹8.67 | — |
| 50 g | ₹370.00 | ₹7.40 | 0.06 |
| 100 g | ₹700.00 | ₹7.00 | 0.13 |
| 500 g | ₹3,387.00 | ₹6.77 | 0.63 |
| 1 kg | ₹6,774.00 | ₹6.77 | 1.25 |
| Pack | Price | Per gram | 10 kg batches at 8% (800 g) |
|---|---|---|---|
| 15 g | ₹104.00 | ₹6.93 | — |
| 50 g | ₹270.00 | ₹5.40 | 0.06 |
| 100 g | ₹500.00 | ₹5.00 | 0.13 |
| 500 g | ₹2,500.00 | ₹5.00 | 0.63 |
| 1 kg | ₹4,842.00 | ₹4.84 | 1.25 |
| Item | Covers | Price |
|---|---|---|
| Raat Ki Rani Fragrance Oil 1 kg | 800 g + 824–840 g with allowance | ₹6,774.00 |
| Luxury Soy Wax Chunks 10 kg | 9,200 g (9,476–9,660 g with allowance) | ₹5,999.00 |
| White Matte Glass Jar × 50 (10 packs) | 50 jars | ₹3,540.00 |
| Eco Candle Wicks Thin C1 × 50 | 50 wicks | ₹295.00 |
| Wick Stickers 40 × 2 | Wicks + batch-code labels | ₹200.00 |
| Consumables | ₹16,808.00 | |
| Candle Making Weighing Scale | Sections 4–5 | ₹354.00 |
| Pen Thermometer | Sections 6 and 8 | ₹354.00 |
| Candle Wax Pouring Jug | Section 8 sub-batch fills | ₹531.00 |
| Bamboo Stirring Sticks × 5 | Section 7 | ₹118.00 |
| Total including tools | ₹18,165.00 |
The wax has less headroom than it looks. A 10 kg pack against a 9,200 g need leaves 800 g, which covers the 3–5% allowance (9,476–9,660 g) but not a large reference pour on top. Add a 500 g pack at ₹299.00 if you want reference candles from the same wax lot. If your line runs on Luxury Soy Wax CSI 464 instead, it is ₹5,074.00 for 10 kg, it is rated up to 10% rather than 13%, and it needs its own formula card and validation.
Change control
A protocol stays true only if changes are controlled. The rule is simple: anything on the formula card, or any step in the SOP, changes only through re-validation. The scale of re-validation should match the change. A new oil lot needs a side-by-side check against the retained sample and a QC burn against a same-age reference. A new wax, jar, wick or load is a new formula. It needs a new card, a cure ladder and a validation batch.
| Change | Treat it as | Minimum re-validation |
|---|---|---|
| New lot of the same oil | Same formula, new input | Cold and hot throw vs retained sample; QC vs same-age reference; see new batch checks |
| Different oil, even a close match | New formula | New card; cure ladder; validation batch; see a near-identical oil |
| Different wax or wax grade | New formula | New card; wick test; cure ladder; validation batch |
| Different jar or fill weight | New formula | Wick test; validation batch |
| Load change | New formula | Cure ladder; validation batch |
| Bigger batch size or new melter | Same formula, new process | Sampled-pour validation at the new size; see scaling to 25 kg |
| New operator | Same formula, same process | Supervised batch with a complete batch sheet |
If your range includes custom blends, the formula card needs one more section: the blend's own component weights and premix method. Documenting a custom fragrance formula covers that. For a whole-range view of choosing oils that will stay available long enough to justify a protocol, see questions to ask about batch consistency and availability, and building a commercial range.
CANDLEMAKINGSUPPLIESINDIA supplies raw materials, not finished candles. A good protocol usually means buying less oil, because it stops batches drifting weak and tempting you to raise the load. We recommend one anyway, because it is the only way to sell the same candle twice.
Oil and wax prices come from CSI's live listings pulled on 24 September 2026. Jar, scale and thermometer prices are as verified for Blog 760 on 10 September 2026, wick and sticker prices are from the 25 September pull, and jug and stirrer prices are from CSI's equipment listings. Batch weights, convention conversions and costs are plain arithmetic, shown so you can check them.
Stir times, the 7-day checkpoint, sample positions, tolerances and code formats are examples of the form, not specifications. CSI publishes no cure-time, batch-consistency or reformulation data for any oil. Temperatures come from the wax maker; CSI's CSI 464 guidance is 80–90°C. For MSDS, IFRA or lot questions, message +91 7397976926.
Frequently asked questions
- My First Candles from a Production Batch Smell Weaker than the Last Ones — Could the Fragrance Oil be Settling or Mixing Unevenly?
- Do All Soy Candle Fragrances Need the Same Cure Time or Can Some Fragrance Compositions Reach Good Hot Throw Faster than Others?
- My Production Team Pours Candles on Different Days — How Do I Standardise Cure Time Before Quality-Control Burn Testing?
- How Long Should I Mix Fragrance Oil into a Large Batch of Wax so the First Candle and Last Candle Have the Same Fragrance Concentration?
- I'm Making 10 Kg of Scented Wax at Once — How Do I Ensure Fragrance Oil Is Distributed Uniformly Throughout the Entire Batch?
- I'm Comparing Two Fragrance Oils — Should I Burn-Test Them at Exactly the Same Cure Age to Make the Comparison Fair?
- How Do I Document a Custom Candle Fragrance Formula so My Production Team Can Reproduce the Same Scent and Strength Every Time?
- My Small Test Batch Has Excellent Hot Throw but the 20 Kg Production Batch Smells Weaker — What Production Differences Should I Investigate Before Blaming the Fragrance Oil?
Customer reviews: The six reviews at the top of this page are genuine, published Judge.me reviews left by CSI customers on the product pages named on each card — Eco Candle Wicks, Premium Candle Wicking Needle and Bamboo Wick Holder. They are general product reviews, not assessments of the guidance set out here. Names, star ratings, dates and products are as recorded by Judge.me and wording is unedited. "Verified buyer" appears only on the three reviews Judge.me recorded as verified — Monika Deep, Subhankar Roy and Sneha Tamang; the reviews from Ashwini, LJ and Lalitha Jagan are published but not recorded as verified, and carry no badge.
Figures pulled 24 September 2026, CSI live pricing: Raat Ki Rani (Night-Blooming Jasmine) Fragrance Oil ₹130.00 / 15 g, ₹370.00 / 50 g, ₹700.00 / 100 g, ₹3,387.00 / 500 g, ₹6,774.00 / 1 kg. Japanese Cherry Blossom Fragrance Oil ₹104.00 / 15 g, ₹270.00 / 50 g, ₹500.00 / 100 g, ₹2,500.00 / 500 g, ₹4,842.00 / 1 kg. Luxury Soy Wax Chunks ₹299.00 / 500 g, ₹599.00 / 1 kg, ₹5,999.00 / 10 kg. Luxury Soy Wax CSI 464 ₹260.00 / 500 g, ₹5,074.00 / 10 kg. Cheapest 15 g oil in the collection ₹68.44. Wicks (25 September pull): Eco Candle Wicks Thin C1 ₹295.00 / 50 (₹5.90 each). Verified 10 September 2026 (Blog 760): White Matte Glass Jar ₹354.00 / 5 (₹70.80 each); Candle Making Weighing Scale ₹354.00; Pen Thermometer ₹354.00. Other CSI listings: Wick Stickers ₹100.00 / 40; Candle Wax Pouring Jug ₹531.00; Bamboo Stirring Sticks ₹118.00 / 5.
Non-price figures and assumptions: Load is a share of finished weight: 10,000 g at 8% = 800 g oil + 9,200 g wax = 50 × 200 g candles. The wax-based alternative: 800 g oil into 10,000 g wax = 10,800 g at 7.41% (14.81 g oil per 200 g). From a fixed wax weight, oil = wax × L ÷ (1 − L): 1,000 g wax at 8% = 86.96 g oil. Material per candle ₹295.30 = oil ₹108.38 + base ₹186.92 (184 g Chunks at ₹599.00 / kg, Thin C1 ₹5.90, White Matte jar ₹70.80), excluding labour, packaging, freight and GST. Wastage allowance 3–5% is a working assumption. Stir times, checkpoint, sample positions, tolerances and code formats are examples, not specifications. Temperatures: wax maker's instructions; CSI's CSI 464 guidance 80–90°C (confirm on the product page). Wax-maker ceilings: Chunks up to 13%, CSI 464 up to 10%. Diwali 2026 falls on 8 November; wedding season is November–February. Prices and availability change; the linked product pages are always authoritative.