Ok, i think i need to say something here. I think this word Cebloplast is getting thrown around way to lightly. Cebloplast was a trade name given to a Cellulose Acetate that the Mazzucchelli company made for the Shaeffer Pen Company back in the 1930's. They are the only person who can call there product Cebloplast and they stopped making it some 80 years ago. I have seen almost all of the Ceblopast colors that they made for Shaeffer and these are none of them. Unless you know this is a vintage material, and most likely bought it form someone other than a pen making vender, than it most likely is not Cebloplast. Now it might be Cellulose Aceate, i dont know that for sure, but im pretty sure that it isnt Cebloplast. Where did you get it?