July 15, 2011

Alum Tanning
The half of the third test strip was left in the alum tanning solution

Vegetable Tanning
Oak
Oak bark tannin solutions were remade to provide more tannic acid for each test strip.
10%- 20 mL of oak bark solution was mixed with 180 mL of distilled water.
15%- 30 mL of oak bark solution was mixed with 170 mL of distilled water.
20%- 40 mL of oak bark solution was mixed with 160 mL of distilled water.
25%- 50 mL of oak bark solution was mixed with 150 mL of distilled water.
50%- 100 mL of oak bark solution was mixed with 100 mL of distilled water.
100%- 200 mL of oak bark solution was mixed with 0 mL of distilled water.
The test strips were returned to their corresponding tannin solution.

Liming
The large test strips were moved from the distilled water to a solution of 3000 mL of distilled water and 30 g of NaOH