THE historical studies of Dr. Nierenstein, who is an authority on the history of the tannins, must be of interest to all workers on the chemistry of tannins and of leather. To read how closely ...
The water-logged peat creates an anoxic ... You can identify a bog body by its color: Over time, the natural tannins in the bog turn the mummified skin a dark brown or black shade, similar ...
The tannin compounds in the hot coffee will more ... What you'll need: Baking soda and water. What to do: Create a paste by mixing equal parts baking soda and tap water. Apply the paste to the ...