Registered trade name (n.m.) in 1963, of the name of the British firm Ozalid, anagram of diazol.

A Ozalid is a positive test carried out by contact with the Typon S, on a special paper (Diazol). Last element of control, it is generally used to give the “approved for printing” (b.a.t in the jargon of the printers).

See too

• Printing works

• Marks used like names