My New Fragrance Oil Smells Almost Identical to the Old One but Has a Different Composition — Can I Use My Existing Wick and Fragrance Load Without Retesting?
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What is the minimum retest? A bridge test: three candles of the new oil and three of the old, at your current wick and load, cured together and compared blind for throw, burn, colour and stability, plus the new documents. See the bridge test.
What if it fails? Then the wick or the load does not carry over, and the oil needs the full retest: a load ladder, a wick check and a stability run. I'm Switching Fragrance Oil Suppliers to Reduce Cost — Which Cold Throw, Hot Throw, Colour, Wick and Stability Tests Should I Repeat Before Production? sets out that list.
Is it worth the cost? The bridge test is about ₹1,936.40 per scent. A 300-candle batch of 200 g candles with the example oil holds about ₹77,824.56 of materials. The test is 2.5% of that. See the risk maths.
What your nose cannot check
When a supplier or a reformulation delivers an oil that "smells identical", the claim is about the finished accord as you perceive it from a blotter, the bottle or a cold candle. Underneath, the oil can be a different mix of aroma materials and carriers that happens to smell similar. Perfumers commonly describe reaching the same impression by several routes. The candle, though, does not respond to the impression. It responds to the materials. The six properties below are general candle-making and perfumery mechanisms, not measurements of any CSI oil. CSI publishes no composition, throw, discolouration or burn data for any oil.
| Property | Why the nose misses it | What it changes in your candle | How to check |
|---|---|---|---|
| Evaporation profile in a hot pool | The bottle mostly shows the lighter materials; the pool releases a different balance | Hot throw, how it develops during cure | Blind hot-throw comparison after the same cure |
| Viscosity and burn behaviour | Nothing to smell | How the wick draws fuel: pool time, flame height, soot, mushrooming | Full burn cycle on your current wick |
| How well it stays bound in the wax | Nothing to smell until it fails | Sweating, frosting, wet spots, especially in heat | Stability candles through a warm spell, to day 28 |
| Materials that change colour over time | Colour change develops over days to weeks | Yellowing or dye shift, most visible in white or pale wax | Candles in light and dark, photographed at checkpoints |
| IFRA maximum for candles | A document, not a smell | Whether your current load is permitted at all | Read the new IFRA certificate before pouring |
| Flash point and storage data | A document, not a smell | Storage and transport handling; not the mixing temperature | Read the new MSDS |
The last two rows are the quickest checks and the most absolute. If the new oil's IFRA certificate permits less than your current load for candles, the load cannot carry over, however the candle smells. A flash point is a safety property for storage and transport. It is not the temperature at which you add the oil to wax, which follows the wax maker's instructions. Does a Fragrance Oil's Flash Point Tell Me the Temperature at Which I Should Add It to Candle Wax or Are These Two Different Things? explains the difference. CSI does not state per-oil flash points or IFRA percentages on this page. Ask for the documents.
"Same name" is not "same oil"
Names do not guarantee compositions, even inside one catalogue. CSI's own Fragrance Oils collection lists two oils called Pomegranate Splash and Pomegranate Splash (second listing), at different prices: 50 g ₹249.00, 100 g ₹399.00, 500 g ₹1,999.00, 1000 g ₹3,999.00; and 50 g ₹192.00, 100 g ₹384.00, 1000 g ₹3,843.00. It also lists two called Spicy Raspberry and Spicy Raspberry (second listing): 15 g ₹99.00, 50 g ₹299.00, 100 g ₹599.00, 500 g ₹2,999.00, 1000 g ₹5,999.00; and 50 g ₹293.00, 100 g ₹585.00 (out of stock), 1000 g ₹5,850.00 (out of stock). Their compositions are not published, and CSI does not claim they are the same or different formulas. The honest rule is to treat any two listings as two oils until a candle test says otherwise.
The same applies to an oil "reformulated" by its maker, a replacement for a discontinued oil, or an inspired-by oil from a new supplier matched to a profile you already use. Each has the one thing you can check quickly, the smell, and none of the things your wick and load depend on. Reformulation and batch-consistency data are not published for CSI oils. Keep a retained sample of every lot, and ask CSI on WhatsApp if you need to know whether an oil has changed. I Need the Same Candle Fragrance for Several Years — What Should I Ask a Supplier About Batch Consistency, Availability and Reformulation Before Building a Bestseller Around It? covers what to ask a supplier about long-term consistency.
The bridge test
A bridge test checks equivalence, not optimisation. It uses your current wick, load, wax, jar and cure, and changes only the oil. Three candles of the new oil (48 g at 8% in 200 g candles) and three of the old oil from your retained stock, poured the same day and cured together. If every check matches the old oil, the wick and load carry over. If any check fails, you have learned cheaply that they do not.
| Check | Pass | Fail → next step |
|---|---|---|
| Documents | IFRA permits your load; MSDS read | Run the full retest at a permitted load (3189) |
| Surface and set (day 1) | Same as old | Check stability over the full period; suspect binding |
| Cold and hot throw (blind) | Testers cannot tell them apart, or prefer the new oil | Re-ladder the load (3189) |
| Burn on current wick | Pool, flame, soot and mushrooming match | Wick check one size up or down (3107) |
| Colour to day 28 | No change beyond the old oil's | Consider a different oil, or a range where colour shift is acceptable |
| Stability to day 28 | No sweating or frosting beyond the old oil's | Lower the load and re-test, or reject the oil |
Test cost vs batch at risk
The case for the bridge test is arithmetic. Here it is for one scent, with Woody Oud as the example new oil in 200 g candles at 8%.
| Item | Quantity | Cost |
|---|---|---|
| New oil for three test candles | 48 g · 1 × 50 g | ₹271.40 |
| Wax for six candles | 1,104 g · Luxury Soy Wax Chunks 1 kg + 500 g | ₹898.00 |
| Wicks (your current size) | Eco Thin C1 10-pack | ₹59.00 |
| Jars | 2 × 5 White Matte Glass Jars | ₹708.00 |
| Bridge test total | ₹1,936.40 | |
| Materials in one 300-candle batch | 300 × (₹72.50 oil + ₹110.22 wax + ₹76.70 wick and jar) | ₹77,824.56 |
| Test as a share of the batch | 2.5% |
The test is worth running if the chance of a problem is more than about 2.5%. That is roughly one in 40. No one can give you that probability for a reformulated oil, because composition is exactly what you do not know. The batch figure also understates the risk. It counts materials only, not labour, packaging, courier costs on returned candles, or a customer who stops buying. Some faults can be rescued, since soy candles with surface faults can often be re-melted and re-poured. A colour shift or a candle that soots on its wick cannot be fixed by re-pouring the same formula.
When the bridge test fails
A failed bridge test tells you which property changed, and that points to the next test. Throw failures lead to the load. Burn failures lead to the wick. Colour and stability failures lead to the oil itself. I'm Switching Fragrance Oil Suppliers to Reduce Cost — Which Cold Throw, Hot Throw, Colour, Wick and Stability Tests Should I Repeat Before Production? lays out the full retest: a 6/8/10% ladder, a wick one size up, and a light/dark stability pair. My Candle Smells Strong at 10% Fragrance Load but the Wick Struggles — How Do I Determine Whether Reducing Fragrance or Increasing Wick Size Is the Better Solution? covers deciding between a wick change and a load change, and Before I Reject a Fragrance Oil for Weak Hot Throw, What Variables Should I Test in Wax, Wick, Dosage, Cure and Room Conditions? lists every variable to test before rejecting an oil for weak throw.
If the oil is part of a blend, test the blend, not the component. A replacement that smells identical on its own can still shift a blend's balance in a hot pool, because the other components now sit beside a different set of materials. If I Blend Two Fragrance Oils That Both Perform Well Individually, Can the Combined Blend Still Give Poor Hot Throw? explains how two good oils can make a poor blend, and How Do I Document a Custom Candle Fragrance Formula so My Production Team Can Reproduce the Same Scent and Strength Every Time? covers documenting a formula so that any change of component triggers a retest automatically.
| Pack | Price | Per gram | Candles at 16 g |
|---|---|---|---|
| 15 g | ₹93.22 | ₹6.21 | 0.94 |
| 50 g | ₹271.40 | ₹5.43 | 3.12 |
| 100 g | ₹453.12 | ₹4.53 | 6.25 |
| 500 g | ₹2,265.60 | ₹4.53 | 31.25 |
| 1 kg | ₹4,531.20 | ₹4.53 | 62.50 |
| Pack | Price | Per gram | Candles at 16 g |
|---|---|---|---|
| 50 g | ₹249.00 | ₹4.98 | 3.12 |
| 100 g | ₹399.00 | ₹3.99 | 6.25 |
| 500 g | ₹1,999.00 | ₹4.00 | 31.25 |
| 1 kg | ₹3,999.00 | ₹4.00 | 62.50 |
| Pack | Price | Per gram | Stock |
|---|---|---|---|
| 50 g | ₹293.00 | ₹5.86 | In stock |
| 100 g | ₹585.00 | ₹5.85 | Out of stock |
| 1 kg | ₹5,850.00 | ₹5.85 | Out of stock |
CANDLEMAKINGSUPPLIESINDIA supplies raw materials, not finished candles. Telling you a new oil can go straight into production would win the order faster. It would also transfer the risk of a failed batch to you. This page gives you the short test that moves that risk back to the bench.
Oil and wax prices are live CSI listings pulled on 24 September 2026, wicks are from the 25 September addendum, and jars were verified for Blog 760 on 10 September 2026. Out-of-stock sizes are marked. Bridge-test and batch figures are arithmetic on those prices.
The six properties are general candle-making and perfumery mechanisms, not measurements. CSI publishes no composition, throw, discolouration, flash-point or IFRA figures for any oil on this page. The checkpoints (day 1, 7, 14, 28) are working practice. For MSDS and IFRA certificates, message us on WhatsApp at +91 7397976926.
Frequently asked questions
- I'm Switching Fragrance Oil Suppliers to Reduce Cost — Which Cold Throw, Hot Throw, Colour, Wick and Stability Tests Should I Repeat Before Production?
- I'm Launching 10 Candle Fragrances — How Do I Decide Which Scents Deserve 1 Kg Fragrance Oil Purchases and Which Should Remain in Smaller Trial Sizes?
- I'm Paying More for a Concentrated Candle Fragrance Oil — How Do I Test Whether the Higher Price Is Justified by Lower Usage and Better Performance?
- My Fragrance Supplier Sent a New Batch of My Bestselling Scent — What Should I Compare Against the Previous Batch Before Making Hundreds of Candles?
- I Need the Same Candle Fragrance for Several Years — What Should I Ask a Supplier About Batch Consistency, Availability and Reformulation Before Building a Bestseller Around It?
- My Fragrance Oil Is Extremely Strong Neat but Weak in the Finished Candle — Why Does Bottle Strength Not Predict Candle Performance?
- Does a Fragrance Oil's Flash Point Tell Me the Temperature at Which I Should Add It to Candle Wax or Are These Two Different Things?
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: Woody Oud: 15 g ₹93.22, 50 g ₹271.40, 100 g ₹453.12, 500 g ₹2,265.60, 1000 g ₹4,531.20. Pomegranate Splash: 50 g ₹249.00, 100 g ₹399.00, 500 g ₹1,999.00, 1000 g ₹3,999.00. Pomegranate Splash (second listing): 50 g ₹192.00, 100 g ₹384.00, 1000 g ₹3,843.00. Spicy Raspberry: 15 g ₹99.00, 50 g ₹299.00, 100 g ₹599.00, 500 g ₹2,999.00, 1000 g ₹5,999.00. Spicy Raspberry (second listing): 50 g ₹293.00, 100 g ₹585.00 (out of stock), 1000 g ₹5,850.00 (out of stock). Luxury Soy Wax Chunks ₹299.00 / 500 g, ₹599.00 / 1 kg. Eco Candle Wicks Thin C1 10 ₹59.00 (25 September addendum). White Matte Glass Jar ₹354.00 / 5 (₹70.80 each), verified 10 September 2026 (Blog 760).
Non-price figures and assumptions: 200 g candles at 8% (16 g oil + 184 g wax). The bridge test (three new + three old candles), checkpoints (day 1, 7, 14, 28) and the 300-candle batch are working assumptions. Batch materials exclude labour, packaging, freight and GST. The six properties are general mechanisms, not measurements of any oil. CSI 464 melt/pour 80–90°C is from CSI's earlier CSI 464 guidance, so confirm it on the product page. Prices and stock change — the linked product pages are authoritative.