I Have 10 Kg Left From My Old Wax Batch and 25 Kg From a New One — How Should I Transition Without Creating Unexplained Changes in Finished Candles?
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What is a bridge pour? On cut-over day, pour a few candles from the last old-lot melt and the first new-lot melt in the same session. Keep one of each as a dated reference pair.
Should I mix the last of the old lot into the new? Not by default. A clean cut-over at a recorded batch is easier to trace. Blending is a separate, deliberate decision made only after both lots have passed.
How much old wax should I keep back? A suggested starting point is 500 g sealed and labelled as a reference, enough for later side-by-side comparisons without tying up useful stock.
Your old lot is runway, not a leftover
Most advice on this situation is about rotation: use older material first so it does not age on the shelf. That is sound, and it still applies. But a goods-in view adds a second point that is easy to miss. The old lot is the only stock you have that is already approved, so it is also the stock that buys you time to approve the new one.
Think of it as a race with a known finish. The old lot will cover a certain number of candles at your usual production rate. The new lot needs a certain number of days to screen, pour, cure and burn. If the runway is longer than the qualification time, you can test properly and switch without any pressure. If it is shorter, you are heading for the morning when the old bag is empty and the only wax on the shelf is untested.
So the first job on delivery day is not to open the new bags for production. It is to do the arithmetic, start the qualification clock and label everything with its status.
The runway arithmetic
Take a maker pouring 150 g candles in thick-walled apothecary jars, with Bergamot Amber at 9% of total candle weight. Each candle takes 150 × 0.09 = 13.5 g of oil and 136.5 g of wax. She holds back 500 g of each lot as a sealed reference, a suggested starting point rather than a rule.
| Lot | Usable wax | Working | Candles |
|---|---|---|---|
| Old lot | 10 kg − 500 g reference = 9.5 kg | 9,500 ÷ 136.5 | 69 |
| New lot | 25 kg − 500 g reference = 24.5 kg | 24,500 ÷ 136.5 | 179 |
| Weeks of old-lot runway at 40 candles a week (reader's rate) | 69 candles | 69 ÷ 40 | about 1.7 weeks |
At her rate of 40 candles a week, the old lot lasts a little under two weeks. The new lot's qualification, allowing a same-day screen, a paired pour, the soy product page's stated 48–72 hour minimum cure and two evenings of burning, fits inside roughly one week. She has room, but not a lot of it. If she produced 80 candles a week, the old lot would last under a week and she would need to either slow production of this line or start qualification before the delivery even arrived, using a sample from the supplier.
The transition sequence
Why the bridge pour is worth an extra hour
The paired test tells you whether the new lot is acceptable. The bridge pour does something different: it anchors your production history. Two candles made on the same day, by the same person, from the same oil bottle and wick packet, one from each lot, are the most direct comparison you will ever have of what changed at the cut-over.
Those two candles earn their keep later. If a customer reorders in two months and says the candle seems different, you can burn the bridge pair and see whether the change you are being told about lines up with the lot change or not. If it does not, you look elsewhere: the oil, the wick, the season. If it does, you have a clear, dated story for the supplier.
| Field | Example entry |
|---|---|
| Old lot code and invoice date | Your receiving code for the old bags |
| New lot code and invoice date | Your receiving code for the new bags |
| Qualification result | Released, paired test notes attached |
| Last old-lot production batch | Batch sheet reference |
| First new-lot production batch | Batch sheet reference |
| Bridge pour candles kept | One old-lot, one new-lot, labelled and dated |
| References retained | 500 g each lot, sealed, labelled |
Staging the cut-over across several products
If one wax feeds several products, you do not have to switch them all on the same day. A staged cut-over moves the new lot into the lowest-risk line first and the most sensitive line last. A deeply coloured candle with a strong oil hides small differences in top finish and colour; a white, lightly scented candle in a clear jar shows everything. Starting with the forgiving line gives you a few more production runs of real-world evidence before the demanding line changes.
Staging has a cost. For a while two lots are open in production at the same time, which means two sets of labels, more care at the melter and a production log that must say which lot fed which batch. For a small workshop with one melter, that extra handling can create more risk than it removes. Decide deliberately, and if you stage, write the plan down: which product switches on which date, and which lot each batch sheet should show.
If the new lot fails before the runway ends
This is where planning pays off. Because you started qualification on the day the delivery arrived, you know about a problem while there are still old-lot candles to be made. Use that time well. Share your screen notes and paired-test photos with the supplier, ask whether anything changed in the product, and agree what happens next. If the supplier is CSI, the channel is WhatsApp +91 7397976926; CSI does not publish lot-specific data on its product pages, so your comparison is the evidence, and a lot that fails goes back in quarantine, including when it came from us.
What you should not do is let the runway end and then release the failed lot because nothing else is on the shelf. If production has to pause on one line for a few days, that costs less than a season of candles that behave differently from the ones your customers reordered.
Where this page fits
CSI already has guides that cover parts of this question. This page covers the goods-in check for the question above; these go deeper on the rest:
Three things to buy for this job
| Option | Price | Status on the September 2026 pull |
|---|---|---|
| 500 g | ₹260.00 | In stock |
| 1 kg | ₹507.40 | In stock |
| 5 kg | ₹2,537.00 | In stock |
| 10 kg | ₹5,074.00 | In stock |
| Option | Price | Status on the September 2026 pull |
|---|---|---|
| Pack of 10 | ₹944.00 | In stock |
| Pack of 20 | ₹1,888.00 | In stock |
| Option | Price | Status on the September 2026 pull |
|---|---|---|
| 15 g | ₹105.02 | In stock |
| 50 g | ₹280.00 | In stock |
| 100 g | ₹560.00 | In stock |
| 500 g | ₹2,718.00 | In stock |
| 1 kg | ₹5,437.00 | In stock |
CANDLEMAKINGSUPPLIESINDIA supplies raw materials and production equipment, not finished candles. This guide separates general quality-control practice from what CSI's own product pages state, says plainly what CSI does not publish (lot numbers, certificates of analysis, tolerances), and labels every sample size, tolerance or retained quantity as a starting point for your own validation.
Prices are live CSI prices from September 2026; product pages are authoritative. Where a spec is not published — such as a lot number, a jar's internal diameter or a wick's burn rate — this guide says so rather than filling the gap.
For bulk quotes, questions about a specific delivery, GST invoicing, IFRA and MSDS documents, message us on WhatsApp at +91 7397976926.
Frequently asked questions
- I'm Buying 25–100 Kg of Wax at a Time — How Should I Rotate Inventory so Older Material Is Used Before Newer Deliveries?
- I Have Half a Drum of an Older Fragrance Batch and a New Drum Has Arrived — Should I Mix Them Together or Transition Between Batches Separately?
- My Supplier Changed the Packaging of My Usual Soy Wax — What Information Should I Verify Before Assuming the Material Inside Is Unchanged?
- My Wax Supplier Says the Formulation Has Not Changed but My Production Results Have — What Objective Tests Can I Run Before Changing My Candle Formula?
- I’m Buying Soy Wax in 25 Kg Quantities for Commercial Candle Production — What Incoming Checks Should I Perform Every Time a New Batch Arrives?
- How Do I Create an Incoming QC Specification for Candle Wax Covering Appearance, Odour, Melting Behaviour, Hardness, Finished Appearance, Fragrance Compatibility and Burn Performance?
- I Bought 25 Kg of Soy Wax and This Batch Looks More Yellow Than the Previous One — Should I Test It Before Making 500 Candles?
- My New Soy Wax Batch Has a Slightly Different Smell From the Last Batch — Is That Normal or Should I Stop Production Until I Test It?
- My New Soy Wax Feels Softer Than the Previous Bag From the Same Supplier — How Do I Check Whether Its Candle Performance Has Changed?
- I Bought the Same Soy Wax Again but the Flakes Look Slightly Different in Size and Texture — Does That Necessarily Mean the Wax Itself Is Different?
- How to Maintain Consistency Between Large Soy Wax Candle Batches
- I Need the Same Soy Wax Every Month for Commercial Candle Production — What Should I Check Before Choosing a Long-Term Supplier?
Customer reviews: The reviews at the top are genuine, published Judge.me reviews — Delcy Fernandes (5★, verified); Arminder Kaur (4★, verified); Tina Raha (4★, verified); Shanu Shah (5★, verified); Judy Roy (5★, verified); Akanksha Sharma (5★, verified). Names, ratings, dates and products as recorded by Judge.me.
Product facts (September 2026, CSI live store): Luxury Soy Wax CSI 464 (flakes): 500 g ₹260.00, 1 kg ₹507.40, 5 kg ₹2,537.00, 10 kg ₹5,074.00 — 100% soy container wax in flakes · single pour · stated fragrance load up to 10% · stated shelf life 60 months (cool, dry storage). Clear Glass Jar with Golden Lid (150 gram): Pack of 10 ₹944.00, Pack of 20 ₹1,888.00 — page: height with lid approx. 8 cm, outer rim approx. 7 cm, base approx. 6.5 cm, 150 g fill, safe for hot pour up to 85°C. Bergamot Amber Fragrance Oil: 15 g ₹105.02, 50 g ₹280.00, 100 g ₹560.00, 500 g ₹2,718.00, 1 kg ₹5,437.00 — top bergamot and citrus, heart amber with soft floral, base woody musk and vanilla · soy 6–10%, paraffin 6–8% · page intensity guide: 6% bergamot leads, 8% balanced, 10% amber comes forward and vanilla/musk base becomes more prominent.
Assumptions: Fragrance load is a percentage of total candle weight (200 g = 184 g wax + 16 g oil at 8%). CSI product pages do not publish lot numbers, certificates of analysis, tolerances, jar internal diameters, wick dimensions or mould hardness; where this guide needs them, it tells you to measure or ask. Sample sizes, tolerances, retained quantities, test lengths and acceptance rules are suggested starting points to validate, not standards or CSI policy. Hypothetical supplier prices are CSI prices adjusted by the stated percentage and labelled as such. Worked examples are illustrations. Prices and availability change — product pages are authoritative.