Sulphuric Acid.—During the War, in a period of shortage of acetic acid and of high prices, this agent was used with success on some estates.
It scarcely need be remarked that it is a dangerous substance to handle, and that its employment must be accompanied by close European supervision.
At prevailing prices during the War it was very much cheaper than acetic acid, and even at the present reduced cost of the latter the advantage still lies with sulphuric acid.
It must be emphasised, however, that the abuse of this agent to any but the slightest degree is harmful to the resultant rubber. Hence its use would be sanctioned only in the absence of the commoner, and much safer, coagulants.
In view of the possible incidence of such an emergency, the following notes are given. It is impressed that strict adherence to the rules must be given.
Handling Sulphuric Acid.—(a) Always use glass or glazed earthenware vessels.
(b) Pour slowly and avoid splashing. Drops finding their way to clothing or other fibrous material will destroy it locally; and if thrown upon any part of the body may cause painful burns.
(c) When diluting this agent always remember to pour the acid into the water (i.e., the lesser into the greater), and never vice versa. Pour the acid carefully and slowly down the side of the vessel, and stir well.
(d) Should strong acid be spilled, do not throw water upon it. A supply of sand or dry earth should be kept close at hand. Throw this upon the acid.
Storing Sulphuric Acid.—(a) Jars or cases should be handled as seldom, and as carefully, as possible. If the acid is contained in a case, the top should be plainly indicated.