1. pipeclay - Noun
2. pipeclay - Verb
To whiten or clean with pipe clay, as a soldier's accouterments.
To clear off; as, to pipeclay accounts.
Source: Webster's dictionaryHis most manly taste did not rise above the kind of military interest which has been defined as "corporal's mania," the passion for uniforms, pipeclay, buttons, the "tricks of parade and the froth of discipline." Source: Internet
The preferred material was pipeclay or "tobacco pipe clay", which fires to a white colour and is only found in certain locations. Source: Internet