Any but the very slightest trace of milkiness in the serum indicates an insufficiency of coagulant.
If the quantity of coagulant has been calculated to an average nicety, the serum should be just dubiously free from milkiness.
The net saving in coagulant alone amounted to 30 cents per million gallons.
Either insufficient acid has been used, or the mixing of latex and coagulant has been at fault.
Such latices are difficult to handle in order to secure uniform mixture with the coagulant.
If a clear serum is obtained always, that should be an indication of continual excess of coagulant.
Of these the substances which would evaporate would be probably the water and the coagulant in most cases.
It is mentioned here merely because some years ago it found a use as a coagulant, chiefly in Ceylon.
This is at once an astringent and a coagulant for the blood, besides stimulating the womb to contraction.
coagulant co·ag·u·lant (kō-āg'yə-lənt)
An agent that causes a sol or liquid, especially blood, to coagulate.