Sumac:
Today we met with Dr. Frett of UD's school of Agriculture and Natural Resources to discuss natural dyes he is growing. We got to see Japanese Indigo (Polygonum tintorium) and Goldenrod (Solidago). He also gave us two types of sumac, Fragrant Sumac (Rhus aromatica) and Staghorn Sumac (Rhus typhina), that can be used for vegetable tanning. I removed the leaves from some of the sumac and soaked each sumac species' leaves separately in distilled water.
Rhus aromatica:
Oak
The various concentrations of oak bark tannin were left to continue the tanning process.
Alum Tanning
The piece of hide in the alum tanning solution was left to continue tanning.
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