0 a chemical substance containing aluminium used in dyeing (= changing the colour of something) and as an astringent (= substance that causes skin to tighten)
It is much improved by adding a little pounded alum, while it is boiling.
Salt and water is used by many as a gargle, but a little alum and honey dissolved in sage tea is better.
The most common dressing consists of equal parts of rock salt and alum dissolved in water.
The alum reacts with moisture in the air to break down the cellulose woodfibresthat give paper its structural strength.
Tissue used for light microscopy was mounted on gelatin-chrome alum-coated slides, cleared, coverslipped, and examined under a light microscope.
These sections are well exposed with three to four levels of stinkstone within a homogeneous succession of alum shale.
