Basically no. I've discussed it with a friend with very relevant experience and it comes down to "it's easy if it's pure, but difficult once you have a blend or

Basically no. I've discussed it with a friend with very relevant experience and it comes down to "it's easy if it's pure, but difficult once you have a blend or contaminants (like gelling agents)." Flame color isn't reliable because you don't know what's burning.