The collodion you buy is not a salted collodion. Salted collodion for wet plate has a limited shelf life. So yes you will need USP collodion ( and not the flexible collodion) , ether, grain alcohol, and depending on the recipe, salts like, cadmium bromide and potassium iodide. As it ages the slower and more contrasty it will become until it is not usable at all. 6 months or a little longer if it is kept refrigerated. I've seen collodion used that was a year old.
Last edited by RobertP; 03-27-2009 at 10:58 PM. Click to view previous post history.