Because these pigments are pure metal, there are some limitations to their use. 

Typically copper or bronze pigments do not tolerate excessive amounts of heat above 200ºF before color degradation will begin. Our “Resisto” can be used where temperatures are expected to fall between 200ºF and 500ºF. Aluminum pigments can withstand temperatures up to 1200ºF. At this temperature, a special high heat resistant coating must be used. 

As to choice of carrier or vehicle, relatively pH neutral products provide a more stable environment for the suspension of metallic pigments opposed to highly acidic or alkaline vehicles. Because the nature of these pigments is to “leaf” or orient themselves near the surface of a paint or ink film, a clear top coat is advised whenever it is likely that a metallic finish will be exposed to excessive handling or where durability is important.