This Pakistan Standard applies to manufactured and hydrated oxides of iron (marigold, brown, maroon and yellow) for use in paints. The material shall be in the from of a dry, soft powder, or in such condition that it may be readily reduced thereto by crushing under a palette knife, without necessitating any grinding action. The material shall be wholly inorganic and its colour shall be due solely to manufactured oxides or hydrated oxides of lron.
PS 172-1962 history
1962PS 172-1962 Manufactured Oxides And Hydrated Oxides of Iron For Paints