Alum shale quarry. Historical artwork of an alum shale quarry on the Yorkshire coast,UK. Alum is the double sulphate of aluminium and either potassium or ammonia. It is used as a fixative in the dying and tanning industries,in cosmetics and as a preservative in food preparation. Alum was quarried in Yorkshire from the early 17th Century until around 1870. Image by Robert Havell from 'The costume of Yorkshire',by George Walker (1814) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / New York Public Library |
Bildgröße: | 5227 px × 3366 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |