So I've been looking for Organic dyes online for a year now and I've found that vendors have no knowledge on the dye's properties. I've looked up several of the ideal dyes I'd like to get my hands on: Anthraquinones, azos, Indigo, the less easily they oxidize and the more thermally stable, the better. I'm looking to make colored smoke flares.
None of these look like the kind of dye you could make at home using easily acquired things (Strangely enough, can't find no Indigo where I live!) , so I want to take the making into my own hands. I read about betanin, the dye found in beets. It may be a good candidate... but then I also read it degraded when exposed to, well, almost any kind of energy (Light, thermal, oxidizes easily).
My question is, could I somehow obtain a organic dye suitable for use in a flare from common vegetable, plant, fruit, spice etc.?