Doing more research... found this: "gentian-violet combination (Thrush Buster)". Seems that the gentian-violet is more of a colorant...
Also seeing recommendations for Copper Naphthenate on several sites...
Yes, that is correct --- more of a colorant. And that is because there might be a teeny weeny chance of getting cancer from too much contact, with pure purple gentian.
That is why I suggested trying to find the pure stuff in an old time apothecary or a hippie health food store. I don't have a name. The stuff I have is in a bottle with the vet's name on it - it was poured from another bottle.
I have been fighting this deep sulci thrush on Joker since last October. Cleaning him twice daily and putting ToMorrow in there twice daily. It wasn't working at all.
There was a white "nub" on one of the heel bulbs. I was really fearful about canker which IS a form of cancer, albeit rare.
With this Purple Gentian that I believe is pure, the sulci on both hooves is drying up at warp speed. I should only need to do a few more treatments.
Which would I rather worry about ----- the minuscule chance of Joker's heels developing cancer from pure purple gentian or the fact the deep sulci thrush has been there since last October and showed no signs of going away with twice daily treatment. No thought required on that one:)
It's like everything else that works but has been taken off the market. 10% iodine hasn't been on the OTC shelf for several years thanks to the meth cookers. Vet's can get it, but we Regular folks can't, we have to buy Triodyne which is only 7% iodine and has something in it to detract the meth cookers from buying it.