The nine things that must be identical

A comparison is only as fair as its least-controlled variable. Before you think about scores, fix everything that is not the oil. The table lists what to hold constant and what goes wrong when you do not. None of it costs extra money; all of it costs attention.

Picking the load for two different oils

Use one load for both, chosen inside both pages' ranges and your wax ceiling. The two-ceilings rule applies to each oil: the lower of the wax maker's stated maximum and the oil page's stated maximum governs. Luxury Soy Wax CSI 464 states up to 10%; Premium Coconut Soy Wax CSI 468 up to 13%. Dark Vanilla states "candles (6-10%)" and Vanilla Bean "Up to 10% for soy wax", so 8% sits comfortably inside everything and leaves room for a retest either side. Where one page states no load, work inside the wax ceiling and say so on your sheet. Maximum is not best: the page ceiling is a formulation limit, not a target.

Pour temperature and the jar

CSI 464's page states a pour temperature of 80°C–90°C. The Clear Glass Jar with Golden Lid (150 gram) page states "Safe for hot pour up to 85°C". If you use both, pour at the lower end of the wax range, at or below the jar's stated figure, and pour both jugs at the same reading. Writing that number down is the cheapest control in this post.

The design: four coded candles, two rooms, four evenings

One candle per oil is a coin toss with extra steps: if one wick sat a little off-centre or one jar cooled faster, you would be comparing pours, not oils. Two per oil lets you see whether both candles of the winner beat both candles of the loser. That is the minimum; the question of how many test candles you need more generally is covered in How Many Test Candles Should I Make Before Buying Fragrance Oil in Bulk?.

The four candles carry only a letter on the base, written by a helper who keeps the key in a closed envelope. K and R are oil A; M and T are oil B. Nobody who scores knows the key until the last evening's sheets are handed in.

Why the rooms swap

Burning the pair at the same time removes differences in weather, time of day and how tired your nose is. But two rooms are never identical: one gets afternoon sun, one has a gap under the door. So on evening 1, K (oil A) burns in room X and M (oil B) in room Y; on evening 2, T (oil B) is in room X and R (oil A) in room Y. Evenings 3 and 4 repeat the pattern with the rooms swapped again. Over four evenings every oil burns in each room twice and every candle once in each room, so a room advantage cancels out instead of deciding the result.

If you only have one room

Burn A and B on the same evening one after the other, each for 60 minutes, and air the room for at least 30 minutes between them with the door and window open. Alternate which oil goes first: A first on evenings 1 and 3, B first on 2 and 4. The second candle of an evening always meets a slightly more tired panel, so alternation shares the handicap.

Round 1 uses 24 g of each oil; round 2 another 12 g each. That is 36 g of each oil at most, which leaves 14 g in each 50 g bottle, enough for one more 8% candle apiece if the result needs a rematch. Round 2 exists because a heavier oil can lose a comparison simply because the wick you chose was too small for it; if one oil's candles fail to reach a full melt pool by hour 3 to 4 in round 1 while the other's do, pour P and Q with the next wick up and compare those two the same way. Pouring them on day 0 alongside the others keeps all six the same age; if you would rather not pour candles you may never burn, pour them on day 7 and judge them at their own day 14.

What the panel scores, and when

Use a 0 to 5 hot-throw scale with plain anchors: 0 nothing, 1 only at the jar, 2 noticeable within arm's reach, 3 noticeable on entering the room, 4 clear across the room, 5 strong across the room. Each judge steps outside for a minute before each check to reset their nose, enters, and scores from just inside the doorway, the same spot every time. The general hot-throw method, including room size and panel make-up, is in How to Test Fragrance Oil Hot Throw Before Buying It in Bulk; here we only need what makes a pairing fair.

With two judges, three check-ins and four evenings, each oil collects 24 hot-throw scores. That is enough to see a consistent difference and not so many that the test drags on. Record the secondary observations too, because they break ties: pool width at 60 minutes and at hour 3 on one long burn per candle, any soot or flicker, and at day 15 a photograph of all four candles side by side in daylight for colour.

The decision rule: win, tie or neither

Write the rule on the sheet before evening 1. Ours has three outcomes, and it deliberately makes a win hard to earn: a 1-point margin is 20% of the whole scale, and smaller gaps are well within what nose fatigue, room differences and pour variation can produce. The threshold is our judgement, not a statistical standard; if you have a larger panel you can tighten it.

Tie-breakers, in order

1. Wick friendliness. The oil that reached a full pool with the smaller wick, without soot or a tall flame, is cheaper and simpler to produce. 2. Colour. If you sell in clear or white vessels, the day-15 photograph matters; vanilla-rich oils commonly darken over time, faster in light. 3. Cost per candle at the size you will buy. Not the sample price: at 50 g Gardenia is cheaper per candle than Jasmine, at 1 kg it is dearer. 4. Stock depth. Check that the 500 g and 1 kg are in stock on the day you order; an oil you cannot reorder is not a winner. 5. Preference. Only now does "I like it more" count, and only as a tie-breaker.

When a comparison proves nothing

Three situations make a result meaningless, and in all three the honest next purchase is not another oil.

Both oils are weak. If both average 2 or below at day 14 with a full melt pool, you have learned about your wick, wax, process or room, not about the oils. A third oil will join them. Go back to the triage in My Candle Smells Weak When Burning — Do I Need a Stronger Fragrance Oil?.

The wick chose the winner. If one oil's candles reached the glass and the other's did not, round 1 compared a well-wicked candle with an under-wicked one. That is what round 2 is for. Heavier, amber- or vanilla-rich oils often need a wick adjustment; test, do not assume (Do Heavy Fragrance Oils Need a Larger Candle Wick?).

The candles were not the same age or load. If one pair was poured a week later, or one oil was dosed by eye, start again. Nothing about the scores can be rescued.

Comparing two suppliers' samples uses the same controls but adds documents, pack sizes and reorder consistency; that is its own protocol in How to Compare Fragrance Oil Samples Before Choosing a Wholesale Supplier.

Two worked pairings, costed

Pairing 1: Vanilla Bean against Dark Vanilla

Both are listed at ₹130.00 for 15 g, ₹410.00 for 50 g, ₹790.00 for 100 g, ₹3,840.00 for 500 g and ₹7,646.00 for 1 kg. Both state a 10% candle maximum and a 48–72 hour minimum soy cure, and both pages flag vanillin (Vanilla Bean states 2.5%; Dark Vanilla says "Vanillin present"). The structural differences the pages give are Dark Vanilla's spiced opening and "dark amber and warm musk" base against Vanilla Bean's "subtle caramel undertones". So a blind pairing is the whole decision. At 8%, oil costs ₹98.40 per candle at 50 g and ₹91.75 at 1 kg for either oil.

If round 2 is not needed, round 1 alone consumes ₹1,074.88 of materials. Without a gram scale, add ₹354.00 (₹1,327.40 in all). All figures exclude labour, freight, packaging and GST. For perspective, a 1 kg vanilla bought on a hunch is ₹7,646.00, 7.9 times the whole pairing.

Pairing 2: Jasmine against Gardenia

Two white florals, both stating up to 10% in soy and a 48–72 hour cure. The new spend is ₹606.42: Jasmine 50 g ₹230.00, Gardenia 50 g ₹223.02 and the C1/C2 packs. Here the tie-breaker on cost matters, and it points in opposite directions depending on the size. At 50 g, Jasmine costs ₹1.68 more per 8% candle (₹55.20 against ₹53.52). At 1 kg, Gardenia costs ₹4.91 more (₹51.98 against ₹47.08), which across the 83 candles a kilogram makes at 8% is ₹407.36. If the pairing is a tie, the production price, not the sample price, should break it. Colour is the other tie-breaker here: Jasmine's page states 0% vanillin, Gardenia's 0.2%; both are the pages' claims, and the day-15 photograph is your evidence.

What to buy for a pairing

Two pairings chosen because their pages make them genuinely hard to separate on paper: identical price ladders in the first, near-identical 50 g prices with opposite 1 kg economics in the second. Plus the one tool that keeps the doses honest. We have not measured the throw of any of these oils; the pairing is how you do that in your own candle. Candle counts assume 150 g at 8%.

Running a pairing before Christmas

Christmas falls on 25 December 2026, 91 days after these prices were checked, and North Indian winter, roughly December to February, is when warm gourmand and vanilla candles come into their own. A pairing started in October leaves time to choose, produce and cure. Diwali, 8 November 2026, is 44 days away; a pairing poured by 1 October reads out on 16 October, which is tight but workable for a Diwali batch.

Frequently asked questions