They are white, and when she smoked, it would rip the tar/nicotine right off those bad boys. you CANNOT change the normal color of the material used, but you can rip off blueberry, coffee, tea, nicotine, and loads of other stuff.
She said she uses 1/3 bleach 2/3 water to soak them. I always thought it was straight bleach. Anyway, she said she rinses, and rinses, and then rinses again so the tissue in her mouth isnt bothered by the residue from bleach. Some times she will rinse, and rinse, then pop them into a denture tablet bath to make sure they are rinsed well. She swears it takes layers of dirt and stain right off um.
Thats my momma!