Re: Prussian blue
Prussian blue can be used in just about any machining/checking operation.
Its lightly brushed on and filed, milled, ground or worn off to show contact/noncontact area.
In most automotive stuff I find it tedious. To check tooth contact I use white grease and to check valve face/seat contact I use pencil. These are far easier to remove for recheck after adjustment. But, the blue is fine if thats what you chose.
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