I don't do any of that. The only time I was "burned" was when I used a piece of old fabric. I did soak a piece first, in hot water and seemed okay. Then it bled. I don't use old fabrics and I do use a color catcher in the final wash and haven't ever had a problem. I don't have any allergies, skin sensitivities, not worried about other people handling the fabric, etc. So far I am still healthy and until I have a reason, will carry on.