Cold Throw vs Hot Throw in Candles

Cold throw is the scent of a candle that is not lit. Hot throw is the scent it gives off while it burns. AFI, a fragrance maker, defines them just that way, and LAFCO calls hot throw the true test of a candle's aromatic power. The two can differ a lot in one candle, so a jar that smells great on the shelf may smell weak once lit, and the other way round.

What does each one depend on?

Cold throw is fragrance molecules evaporating from the wax at room temperature. LAFCO says a cheaply made candle can still have a strong cold throw. AFI says lighter top notes such as citrus, fresh fruit and light florals dominate it. Craftybase says soy and coconut waxes tend to have good cold throw.

Hot throw needs a melt pool. Craftybase says it is the scent released once the candle burns and a full melt pool has formed. AFI says heavier notes such as vanilla, amber, sandalwood, musk and patchouli need heat to become noticeable. For the wick side, AFI says a melt pool should reach the container edges, and that signs of an undersized wick include a small flame, a narrow pool and weak hot throw. Our guide on weak hot throw covers fixes.

Which wax is better for which?

The sources disagree, which is a good reason to test your own. Craftybase says paraffin is traditionally favored for hot throw because its lower melt point makes a larger, hotter melt pool, and that soy burns cooler. LAFCO says soy wax and essential-oil fragrances perform better than paraffin and synthetic fragrance oils. AFI says different waxes perform differently with different fragrance types and gives no pairings. All three are sellers with their own products, and none gives test data in the pages I opened.

When should I judge them?

After the cure. AFI says curing continues after the wax hardens and improves both hot and cold throw, and that testing too soon leads to wrong conclusions. Its general cure times are paraffin 3 to 5 days, parasoy blends about 1 week, 100 percent soy at least 1 to 2 weeks, coconut about 2 weeks, and beeswax or palm 7 to 10 days. Craftybase says most candles need 1 to 2 weeks. Your wax maker's own sheet comes first. Our cure guide has more.

Worked example: scoring both

Say you pour three test candles and have three people rate each from 1 (none) to 5 (strong), cold first, then hot after the burn. The ratings below are made up for the math.

Candle A is the shelf trap: 4.67 cold and 2.33 hot. Candle B is the reverse, a quiet jar that fills a room once lit. Candle C is balanced. Look at the gap too: A is 14 / 3 - 7 / 3 = 2.33 points apart, and C only 12 / 3 - 11 / 3 = 0.33. Which matters more depends on how you sell. Online buyers never smell the jar, but a shop shelf lets them.

Common mistakes

• Judging a candle by its cold throw alone.
• Judging hot throw before the cure.
• Smelling it while sitting next to it for an hour. Your nose gets tired.
• Adding more oil to fix a quiet hot throw. Past the wax's limit, that makes things worse. See our guide on the maximum load.
• Changing wick, load and oil together, so you do not learn which one mattered.

Questions

Is cold throw or hot throw more important?

It depends on the buyer. LAFCO calls hot throw the real test. A candle that sells on a shelf still needs cold throw to get picked up. Track both.

Why does my candle smell strong in the jar and weak when lit?

Usually the wick or the melt pool, per AFI, or a wax and oil that do not suit each other, per Craftybase. Check that the pool reaches the edge, and burn test a different wick.

Can I improve cold throw without hurting hot throw?

I did not find a source with a tested answer. Craftybase says the oil's quality matters for throw, and AFI says to use candle-safe oils. Change one thing, then test both.