Scheele’s green (CuHAsO3) is a hydrocupric arsenite, and contains 52·8 per cent. of arsenious anhydride and 33·8 per cent. of copper.
(6) External Application of Arsenic for Sheep, &c.—Many of these are simply solutions of arsenic, the solution being made by the farmer. Most of the yellow sheep-dipping compounds of commerce are made up either of impure carbonate of potash, or of soda ash, arsenic, soft soap, and sulphur. The French bain de Tessier is composed of:—
| Arsenious Acid, | 1·00 | kgrm. |
| Ferrous Sulphate, | 10·00 | „ |
| Peroxide of Iron, | 0·40 | „ |
| Gentian Powder, | 0·20 | „ |
This is to be added to 100 kgrms. of water. Another common application consists of alum and arsenic (10 or 12 to 1), dissolved in two or three hundred parts of water.
(7) Arsenical Soaps, &c.—Arsenic is used in preserving the skins of animals. One of the compounds for this purpose, known under the name of Bécoeur’s arsenical soap, has the following composition:—
| Camphor, | 3·4 | per cent. |
| Arsenic, | 20·2 | „ |
| Carbonate of Potash, | 56·2 | „ |
| Lime,[714] | 20·2 | „ |
[714] The dust from the preserved skins of animals has caused, at least, one case of poisoning. Ann. d’Hyg. Pub. et de Méd. Lég., 2 sér., 1870, t. xxxiii, p. 314.