Personal experience or opinions please!
I began using aniline dye mixed with alcohol for the NGR benefit of it. Now I am haunted by all the published references to alcohol-based dyes not retaining their color as long as water-based dyes. Really now, under normal interior lighting conditions, what is the lifespan difference between alcohol-based vs: water-based dye? Can someone please express this in a definable length of time--like 10 years, 50 years, 100 years...or what?
Also, instructions for water-based dye say to mix with warm water. If I mix a quantity and want to use it later, should I reheat the mixture before using it?
...as always, Thank You!