After the Choco soap experience, I've decided to try cocoa butter in candles (75% w/w of soy wax and 25% w/w cocoa butter).
I thought the color would look amazing and very natural, and the scent of cocoa butter delicate and pleasant.
I have tried, for glass jars of the same size, a cotton wick or a wood wick.
Couple of remarks: 1) the wax/butter mix takes forever to cool down (very low melting point of cocoa butter) 2) Lot of frosting and shrinking (see pics below)
I let the candles set for several days and then proceeded with the burning test.
Here you can see pictures taken at 1, 30, 90 minutes after burning.
To be honest, the candles burned very slowly and I couldn't smell the chocolate scent of cocoa butter.
The wood wick behaved better than the cotton wick, nevertheless none of the two burned large enough to form a full burning pool after several hours (a lot of tunneling!!!).
Take home message: I don't think it's worth using such an expensive butter for candles you burn on your table (probably it's worth using it for massage candles, given it's low melting point).