Regarding the Silver solution Christopher James: The Book of alternative photographic processes page 472: Precipating Contaminates from a discolored Silver Nitrate Solution with Kaolin. " You can maintain a silver nitrate solution for years if you add 15g of Kaolin to every 1000 ml of your silver nitrate solution...... Mr. Goldfarb is right toning is pretty much a must. The albumen print should also be processed right after exposure, longer contact between excess silver and the albumen results in yellowed highlights. Again Good luck