To test the concentration at which goat hide will be best tanned with oak bark, I used the oak bark solution created yesterday. I prepared solutions ranging in concentration from 10%-100% oak bark solution as follows:
15%- 30 mL of oak bark solution and 170 mL of distilled water.
20%- 40 mL of oak bark solution and 160 mL of distilled water.
25%- 50 mL of oak bark solution and 150 mL of distilled water.
50%- 100 mL of oak bark solution and 100 mL of distilled water.
100%- 200 mL of oak bark solution and 0 mL of distilled water.
To each of these solutions a piece of the large test strips were added.
Alum Tanning
The half of the third test strip in the alum tanning solution was left in solution to continue tanning.
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