This is a quick outline for my experiment, which if you don't remember is a comparison between au naturale and chemical dyes.
First of all, I have to soak the material in different dyes for the same amount of time and liquid dye.
I would then leave them to dry, which should take an approximately equal amount of time.
After drying, I could apply my various tests to them. e.g exposing them to the sun for a long period of time, repeatedly washing them, leaving them out in the rain. For each test I would use a newly dyed fabric though, otherwise the final results will be affected by all the other variables. They would keep compounding, each affecting the next result.
Wait! No. For my experiment I'll use 2 fabric samples of each dye - one which is solely for the use of each applied variable and another which is subject to all variables.
Finally, I would record my observations and probably tabulate them or something...
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