potash alum

Petraeus, himself a Sosh alum, became the central figure for a mix of reasons.

This I attribute to the potash being in a little more caustic condition than when recrystallised with iodine.

It dissolves in dilute potash, and on the addition of acetic acid is deposited in a pure state.

Eventually, however, both varieties become converted into clay, their magnesia and potash passing gradually into soluble forms.

All of them are particularly rich in potash, and contain but a small proportion of phosphoric acid.

If they require a second water put alum to that also as well as to the rinsing and blue water.