Should I Count Jar-Cleaning Labour, Jar Preheating and Slower Cooling as Part of the True Manufacturing Cost of My Current Wax?

The straight answer: yes — but charge each step to its cause, not automatically to the wax

Every step you add to get clean glass is a manufacturing cost: someone's time, some energy, some shelf space, a bottle of spray. Leaving those out makes your current candle look cheaper than it is. But there is a trap in charging them to the wax. Cleaning glass is commonly recommended whatever wax you pour, because residue on the glass is a cause of wet spots in its own right. A wax change would not remove it, so its cost belongs in the base cost of every candle, not on your current wax's account. Preheating and slower cooling are different: if another wax genuinely gave clean glass without them, they are a cost of the current wax, and the comparison should say so.

This page prices the three steps for a worked example — a 35 g candle (a labelled example fill; CSI does not publish this jar's fill weight, so weigh your own) in Mini Glass Jars 40 ml with Natural Soy Pearl Wax at 8% Eucalyptus Spearmint, at an example 3,000 minis a month. On example labour, energy and space figures, the three steps add ₹1.92 to a candle that otherwise costs ₹61.41 — 3.0% of the total. In a small jar the process is a bigger share, because the work per jar is the same whether the jar holds 35 g or 150 g: the same ₹1.92 is 0.9% of a 150 g candle in the Clear jar.

So the answer is yes, count them — but as separate lines, each charged to its cause. Then the first test is not a wax test. It is a test of your current process, removing one step at a time in your current wax, to find out which steps are actually doing anything. A step that does nothing is a saving on its own; a step that matters is the one a new wax would have to make unnecessary.

How to cost each step honestly

Cleaning. Time one tray: spray, wipe, set to dry. At an example 15 seconds a jar and ₹150.00 an hour, that is ₹0.62 of labour. The spray is Isopropyl Alcohol Spray — ₹383.00 for 150 ml or ₹520.00 a litre; CSI publishes no jars-per-litre figure, so the example 1000 mini jars a litre gives ₹0.52 a jar until you measure your own. Isopropyl alcohol is flammable: use it away from flame and heat, and only warm or pour into fully dry jars.

Preheating. Two costs: the handling time to load and unload the warmer (an example 2 minutes a tray of 25 = ₹0.20 a jar) and the energy (an example ₹4.00 a tray = ₹0.16 a jar). CSI does not sell a warming oven or cabinet; whatever you use is your own equipment, and its purchase is a one-off, not a per-jar cost — spread it over its working life only if you would not otherwise have bought it. The temperature is yours to measure and record; a labelled example for glass is 35–45°C, never hotter than your pour temperature. CSI does not publish a hot-pour limit for the Mini jars, and Natural Soy Pearl's page publishes no pour temperature: follow the wax maker's and jar supplier's instructions, or ask CSI on WhatsApp.

Slower cooling. Usually a cover, an insulated box or a warmer room, and a longer time on the shelf. The labour is small (an example 3 minutes a tray = ₹0.30 a jar); the real cost is capacity. If trays sit 12 hours instead of 4, the same shelves hold a third as many batches a day. If that forces you to rent space or buy another rack, put its cost per tray in (an example ₹3.00 a tray = ₹0.12 a jar). If your shelves are never full, the extra hours cost nothing in cash and you should say so rather than inventing a figure.

Put together, the steps add ₹1.92 a jar and ₹5,775.00 a month at 3,000 minis. Of that, cleaning — ₹1.15 a jar — stays in the base cost whatever wax you use. The removable part, preheating and slower cooling, is ₹0.78 a jar. That is the most a different wax could save you on process, and only if a test shows it really does without both steps. Whether a wax that removes preheating pays for itself runs the time-saving case on a larger jar; this page owns how to cost and attribute the steps.

What the removable cost is worth in a wax comparison

In a 35 g mini, each candle holds 32.2 g of wax. A removable process cost of ₹0.78 a jar is therefore worth up to ₹24.22 a kilo of extra wax price — a wax that cost that much more than Natural Soy Pearl and removed both steps would break even on these examples. At CSI's 5 kg bag prices, the extra wax cost per mini over Natural Soy Pearl is ₹2.66 for CSI 464, ₹5.61 for Chunks and ₹6.83 for CSI 468.

These are ceilings, not predictions. CSI publishes no adhesion data and no claim that any of its waxes needs no preheating; the product pages for Chunks, CSI 464 and CSI 468 all claim good glass adhesion, and Natural Soy Pearl's page makes no adhesion statement. Whether any candidate gives clean glass without warming or slow cooling in your Mini jars is exactly what a test has to show. The Wax A vs Wax B post folds process costs into cost per visually acceptable candle; the section hub applies the same logic at 2,000 candles a month.

The ablation test: remove one step at a time, in your current wax

Three arms, all in Natural Soy Pearl Wax, same oil bottle, same 8%, same wick, same jar delivery, same pour temperature. The control arm gets your full current routine: cleaned, warmed, slow-cooled. The second arm drops preheating only. The third arm drops slow cooling only. Cleaning stays in every arm, because it is base cost and a commonly cited cause on its own. Each arm differs from the control in exactly one step, so a difference in wet spots can be pinned on that step. 8 jars per arm is a working practice — small jars are cheap, and with 8 one spotted jar moves an arm by 12.5%. How many jars per arm covers arm size, and the checkpoint post explains why the post-cycle grade is the one that counts.

Read the result step by step. If dropping preheating leaves the acceptable share where the control is, preheating was not earning its cost in this jar and wax — drop it and the saving is yours with no purchase. If dropping it makes things clearly worse, it is doing real work, and its cost is what a candidate wax would have to remove. Same for slow cooling. Only the steps that matter go into a wax comparison, and then the candidate arm runs without those steps beside a control that keeps them. Locking the approved process covers writing the surviving steps into the SOP.

The priced kit

The black-lid Mini jars cost ₹25.96 each in the pack of 5, ₹25.37 in the 25, ₹23.60 in the 50 and ₹21.24 in the 100 — so 24 jars are cheapest as 1 × pack of 25. The golden-lid version lists its 25 and 50 packs at the same price; confirm on WhatsApp before ordering 25. The Eco Thin C1 line is an example wick only: CSI publishes no wick size for this jar, and the test involves no burning. A warmer, a cover or insulated box, and a surface thermometer are your own equipment.

The decision rule

If a candidate wax later wins, price it from the listed bags: at 32.2 g a mini, 3,000 minis a month need 99.50 kg with a 3% pour-loss working allowance — Natural Soy Pearl 10 × 10 kg for ₹42,480.00, CSI 464 9 × 10 kg + 1 × 5 kg + 4 × 1 kg + 1 × 500 g for ₹50,492.60. Larger quantities are quoted on WhatsApp; no volume discount is published. A 50–100 candle pilot comes before any large order.

The CSI products in this test

Where this fits in the section

This page owns how to cost cleaning, preheating and slow cooling and which wax to charge them to. The preheating post asks whether removing a step justifies a dearer wax; the reject ledger prices the rejects the steps are meant to prevent; Wax A vs Wax B folds process cost into cost per acceptable candle; the SOP post locks the steps that survive; the winter hub covers glass and pour temperature in depth.

Frequently asked questions