lead tetroxide

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lead te·trox·ide

a bright orange-red powder that turns black when heated; used in ointments and plasters.
References in periodicals archive ?
Except for litharge and red lead, dibasic lead phthalate is the lead stabilizer most widely used in elastomers.
It had a thin red lead with a metal choker type collar.
Red leads the way with 25.4 per cent, followed closely by blue on 23.7 per cent.