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While there may be other alcohol soluble/water insoluble dyestuffs, there is one, nigrosine, which comes in three varieties: Nigrosin water soluble (Acid black 2), Nigrosin oil soluble (Solvent Black 7), Nigrosin alcohol soluble (Solvent Black 5). However as to being freely available.... Your...

Many thanks! So bees can tolerate quite large amounts of thymol! Incidentally I was interested in your observation in your post cited by Skyhook above about the oil which contains thymol floating on the surface of the syrup. Did this occur with both surgical spirit and isopropyl alcohol?

Carvacrol is the isomer of thymol. While thymol dissolves in water at about 1 g per litre, carvacrol is practically insoluble in water, so that could be the start of a problem there.

I agree that Thymol has been used for a long time, but anything, including water, can be toxic. My question is does anybody know at what level thymol can start to have adverse effects on bees? Is the LD50 for thymol known in bees? The LD50 for oral thymol in rats is 980 mg / kg. Also there is...

From reading several forums and Randy Oliver's website it seems that thymol can be used for preventing fungal growth in sugar syrup and also for treatment of nosema (although not licensed for the latter). The commonly recommended concentration seems to be 0.44mm thymol, which is an effective...