The employment of guncotton as a propellant was possible only after the discovery that it could be gelatinized or made into a colloid by the action of so called solvents, e.g.
In the normal thyroid there is formed and stored up in the spaces this colloid material.
The separation of organic substances by filtration under high pressure through a colloid membrane, gelatine supported in the pores of a porcelain filter being usually employed.
Trans., London, 1893); Notkin, " Nature of Colloid in Thyroid Gland," Arch.
Some solutions of nitroglycerin (in ether, acetone, &c.) burn quietly, and the same is the case when it is held in solution or suspension in a colloid substance, as gelatinized guncotton, &c.
These cells become swollen by this translucent substance and are thrown off into the space where they become fused together, forming colloid masses.
The wax-like or amyloid substance has a certain resemblance to the colloid, mucoid and hyaline.
If we assume that a certain minimum electric charge must be brought into contact with a group of colloid particles to produce coagulation, twice as many univalent ions must collect to produce the same effect as a number of divalent ions, and three times as many as an effective number of trivalent ions.