Quick question regarding some staining on my hand while testing and adding chemicals. Seems like every time i run a full set of tests using my TF-100 test kit (inc. Salt drop test) and then add the required chemicals, i get staining on my hands. Not sure what combination of testing or adding of bleach / muriatic acid that is causing the staining. I guess I should just wear gloves, but I was curious if I am the only one with purple hands and a sparkling pool.