I Want to Make Scented Candles in Glass Jars — What Should I Decide First: Jar Size, Wax, Fragrance Oil or Wick?

The dependency chain, drawn out

A candle is not four independent purchases. It is a chain in which each link takes an input from the one before. The useful way to see it is to ask, for each decision: what do I need to know before I can make this? The jar is the only one where the honest answer is "nothing except what you want to sell".

Notice the asymmetry in the third row. The wick is the only decision with two upstream inputs and zero downstream consequences. That combination is exactly what makes it a bad first decision and a perfectly safe third one. And notice the last row: process is a decision too, and it is the one that turns a lucky candle into a product. Everything you write down on the first pour is what lets the fifth pour match it.

What each decision costs to reverse

Dependency tells you the logical order. Reversal cost tells you why the logical order is also the cheap one. The table prices each change on CSI's smallest listed packs, because the smallest listed pack is the real cost of a mind changed.

Decision one: the jar, and the three numbers it gives you

Choose the jar for the candle you want to sell: its size, its look, its price point, whether it takes a lid. Then take three numbers off it, because those three numbers are the whole reason it goes first.

The first is the weighed wax fill in grams. Many listings — CSI's included — state capacity in millilitres, which is a volume and not a mass. The 200 ml Salsa jars, for example, state that "The 200ml capacity provides ample space for crafting beautiful votive or single-wick candles" and give no dimensions at all. So melt wax, fill one jar to about a centimetre below the rim, weigh it, and use that number forever. The second is the internal diameter, measured between the inside faces of the glass at the level the wax will sit. The third, where the page gives it, is the hot-pour limit.

Decision two: the wax, constrained by the glass

Once the jar is fixed, the wax decision narrows in three ways. Format: a glass jar means a container wax, not a pillar wax. Temperature: if the jar publishes a hot-pour limit, the wax's stated pour window must sit inside it. And load: the wax's stated ceiling becomes the maximum dose available to whatever oil you choose in decision four.

Decision three: the wick, which needs both of the above

Now you have the two inputs a wick actually requires: a diameter and a wax. This is also the point at which no supplier can give you an answer from a distance, and it is worth being plain about why. Only two CSI wick pages state a diameter at all — Eco Candle Wicks Loose ("designed specifically for 2 inch diameters") and Cotton Braided Wicks Ready Made ("engineered for large-diameter candles exceeding 8 cm"). Everything between those anchors is your burn test, because wick demand depends on the glass, the wax and the load acting together, and nobody can compute that from a product photograph.

What you do instead is bracket. Pour three identical jars — identical wax, identical load, identical pour temperature — and vary only the wick: Thin (C1) at ₹5.90, Thick (C2) at ₹9.44, and whichever of the two you think is right in the middle position as a repeat. Cure, trim to about 5 mm, burn two to three hours, and keep the wick whose melt pool reaches the glass in roughly that time with a short steady flame. A tall or restless flame means the wick is too large; that is a safety problem, so extinguish it and step down rather than watching to see whether it settles. And never decide from one burn — if a result surprises you, repeat the pour before you change a material. The method in full, including the case where a kit handed you a wick you cannot identify, is in the kit-wick guide, and there is a diameter-led overview in best wick for candle making by diameter.

Decision four: the fragrance oil, the one you may change freely

By the time you reach the oil, three constraints are already known: your candle's weight in grams, your wax's stated load ceiling, and a wick that works at that load. The oil decision is now simple arithmetic plus two checks. The arithmetic: at an 8% load on a 170 g candle you need 13.6 g of oil per jar, so a 50 g bottle covers three jars and a 100 g bottle covers seven. The checks: the oil's own recommended candle load, which may be lower than your wax's ceiling, and its flash point, which should sit comfortably above the temperature at which you add it.

The Gardenia and Eco Soy rows interact in a way worth catching. Gardenia's page states a flash point of 98°C and instructs you to add it to wax below that temperature. Eco Soy CSI 400 asks for fragrance at 85°C. Those two numbers are compatible — but with only 13°C between them, the thermometer stops being optional. That is the kind of conflict that only surfaces when you read both pages, and it is a good argument for making the oil decision consciously rather than by habit.

The whole sequence, costed

Here is the order as one order and one week. It assumes the 200 ml Salsa jar, a weighed fill of 170 g, Eco Soy CSI 400 at 8% and Jasmine from the 100 g bottle. Substitute your own weighed fill and every number moves proportionally.

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