Quick Answer
An ideal ratio of brain to hide for effective tanning is about 1 part brain to 4-6 parts hide weight. This ratio allows for sufficient enzyme action to break down the collagen in the hide. Too little brain can result in ineffective tanning, while too much can cause the hide to become too soft.
Measuring and Preparing the Hide
To begin the tanning process, the hide must first be fleshed and cleaned. Remove any excess fat, blood, and other tissues to ensure even tanning. A 1/4 inch (6 mm) margin around the edges of the hide should be left intact to prevent drying out.
Applying the Brain and Enzyme Action
Mix the brain with water at a ratio of 1:1 brain to water to create a pulp. Apply this pulp to the hide, working it into every layer of the skin. The enzymes in the brain will break down the collagen in the hide, allowing it to become more pliable and receptive to tanning. Let the hide sit for 2-3 days, allowing the enzymes to work their magic. After this period, rinse the hide in cold water to stop the enzyme action.
Stretching and Smoking the Hide
Once the hide has been tanned, it can be stretched on a frame or over a hoop to dry. Apply weights or tension to the hide to create a tight, smooth surface. Smoke the hide over low heat for 2-4 days to enhance its durability and resistance to water. The ideal temperature for smoking is between 100°F and 150°F (38°C and 65°C).
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