Hi Roger,
I have a Tandy store local, and I do not get warm fuzzies about any of the Eco Flo products, even from the workers there.
My sense of it is that they developed the Eco Flo to be "environmentally friendly". I prefer dye that works, and keep my hands out of it.
Do some online searches, and you will see lots of comments about that dye. I don't care for it, but then, I am no expert.
Best wishes, and God Bless, Marc