WHILE general opinion ascribes the appearance of temper colours to interference between the light reflected from the outer and inner surfaces of a coherent film of oxide, no very definite proof ...

A paper from America, by Messrs. Pilling and Bedworth, deals in a novel manner with the oxidation of metals at high temperatures, an aspect of corrosion which has received comparatively little ...

In this reaction, carbon is oxidised because it gains oxygen. At the same time, copper oxide is reduced because oxygen is removed from it.