and mordants increase the color density . I watched a program at BBC about mordant making from seashells at the shores of England. Flat bottomed boats come to the shore and sit to the ground after tidal wave goes and horse carriages carry these shells to the ships. It was one of the biggest industry in England until the 1900s. I think seashell have calcium aluminum inside and oxidised at big burning pits.
Yes , it was alum , alum trade !
Thank you for the tip .
Last edited by Mustafa Umut Sarac; 07-01-2010 at 12:30 PM. Click to view previous post history.