The urine containing the acid was on the third day still clear and free from ammoniacal odour, whilst the other portion was far advanced in putrefaction.
Professor Thiersch has investigated the antiseptic action of this acid, specially in relation to surgery. He has found that as a powder, either alone or mixed with starch, it destroys for a long time the fetid odour of cancerous surfaces or uncleansed wounds, without setting up any inflammatory symptoms. A solution of one part of salicylic acid, and three parts of sodium phosphate in fifty parts of water, promotes the healing of granulated surfaces.
According to Dr Rudolph Wagner, salicylic acid may be applied to the following industrial purposes:—
If a concentrated aqueous solution of salicylic acid be applied to fresh meat, and the meat be then placed in well-closed vessels, it will remain perfectly fresh for a long period. This solution is also very useful in the manufacture of sausages and such food. Butter containing a bitter salicylic acid will remain fresh for months, even in the hottest weather. The same acid prevents the moulding of preserved fruits. In the manufacture of vinegar this acid is of great utility.
The addition of a little salicylic acid renders glue more tenacious. The acid also prevents decomposition in gut and parchment during their manufacture.
Skins to be used for making leather do not undergo decomposition if steeped in a dilute solution of salicylic acid.
Weaver’s or bookbinder’s glue and other allied substances may be preserved for a long period by treating them with a solution of this acid.
Albumen may be preserved by the same means.
This acid is a very delicate test reagent for iron.
The methyl ether and amyl ether of salicylic acid are used as perfumes. The calcium salt on keeping and distilling with water yields a liquid which has a strong odour of roses.