ALCHEMY - YELLOW WELD LAKE
Weld Dye/Lake By Lady Symonne de la Croix 29.3.20 20gm Weld (dried and crushed) 2lt Demineralised Water (pH 6.8) 1tsp Calcium Carbonate (chalk,eggshells) 20gm Soda (sodium carbonate) 20gm Alum (potassium aluminum sulfate) Soak the dry weld overnight Heat for 1-2hrs It wasn't turning yellow so I added 1tsp of crushed egg shells (as I couldn't find my chalk and they are both calcium carbonate.) Still couldn't see a difference so I left it overnight again. I did some more research that led me to add 20gm of soda which went yellow instantly, so I probably didn't need to wait overnight. (pH 10) I reheated the weld dye bath then sieved it through cloth. Linen would have been used in medieval times as it was cheaper than cotton . Then I added 20gm Alum dissolved in cup of hot water which frothed nicely (pH 8) I decided on a side experiment: I didnt like that t