Two Team Members Pour the Same Candle Differently and the Results Are Inconsistent — Which Production Steps Need Written Specifications Rather Than Personal Judgement?

Why two good pourers make two different candles

It is tempting to assume one person is simply better at pouring. Occasionally that is true. Much more often, both are doing exactly what they were shown, and what they were shown included gaps. 'Pour when it has cooled a bit.' 'Stir it well.' 'Fill to about here.' Each person fills those gaps with their own habit, and each habit is repeatable, so the two sets of candles are consistently different from each other.

The fix is to replace every gap that can affect the candle with a specification: a number, a tolerance, the instrument that checks it and a line where the reading is recorded. Steps that cannot affect the candle can stay flexible. The skill is telling the two apart.

The steps that need a written specification

Here are the ten pouring-stage steps that most often differ between people, with what the specification should contain. Where CSI publishes a figure, use it. Where it does not, the number is yours to choose and validate, and the sheet should say so.

Notice that two rows use CSI's published figures and the rest need your own. The Eco Soy CSI 400 instruction to add fragrance at 80–90°C and stir for 2 minutes is a stated figure; the stated pour range of 58–60°C for CSI 468 is another. For waxes without published temperatures, write 'the wax maker's stated temperature' if one exists on the pack, or your own validated figure, labelled as such.

Finding the step where your pourers differ

The observer's notes almost always show one or two steps that explain most of the difference. One person pours as soon as the wax is off the heat; the other waits. One person pours slowly against the side of the jar; the other pours fast into the centre. One person sets jars down next to the open window. Those are the steps to specify first.

Where judgement is still allowed

Not every difference matters. If one person works left to right and the other right to left, the candles do not care. If one holds the jug with two hands and the other with one, and both hit the pour temperature, pour speed and fill weight, the style is irrelevant. Specifying these creates rules without benefit and makes the rules that do matter easier to ignore.

The test is simple: can this choice change the finished candle, or can it change safety? If yes, specify it. If no, leave it to the person. Safety choices, such as how full a jug is carried, where the power lead runs, and wearing heat-resistant gloves around wax at pouring temperature, are always specified.

Training and sign-off against the specification

A specification that lives in a folder changes nothing. It has to reach the pouring table in a form people use while their hands are full of hot wax. The most practical format is a single laminated card per station listing only the pouring-stage numbers: addition temperature, stirring time, pour temperature range, fill weight and tolerance, cooling layout. The full document stays in the office; the card is what gets read.

Then sign people off against it. A new or existing pourer fills a set number of jars, say ten as a starting point, while someone checks each reading on the station card. If every reading is inside specification, that person is signed off for that product. If not, they repeat. Record the sign-off with the date and the specification version, because when the spec changes the sign-off has to be repeated.

This also answers the uncomfortable question of whether one person is genuinely less skilled. Once both pourers are measured against the same numbers, the data shows it. Usually both pass and the inconsistency disappears. Occasionally one person struggles with a specific step, such as holding the pour temperature while working quickly, and you can train that step rather than the whole job.

Prove the specification works

Once the new specs are in place, repeat the side-by-side pour with the same two people. This time the observer checks compliance: were the jug readings inside the range, were fill weights inside tolerance, did jars go to the specified cooling positions? Then cure and compare as before.

If the two sets of candles are now indistinguishable, the specification has done its job and becomes the standard. If a difference remains, look at the observer's notes again. There is a step you have not specified yet, or a spec that nobody could meet with the tools provided.

One last point, honest and slightly against the instinct to buy: you do not need new equipment to solve this. You need a thermometer at every pouring station, a scale for fill weight, and a sheet that asks for numbers. Buy more only if the retest shows a spec that cannot be met with what you have.

Where this page fits

CSI already has guides that cover parts of this question. This page takes the production-floor angle; these go deeper on the rest:

Three things to buy for this job

Frequently asked questions