That ad lies! Prussian Blue is anything but easy to clean up! It stains everything it touches a dark blue that's VERY persistent! Great stuff for doing precision fitting, though! I use it instead of lapping compound to check valve-to-seat contact width.
Jerry



"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!