From my days working with Neon signs..
I'm sure this will apply to metal parts that have been worked with a lot of friction or heat.
I found out the hard way about the adage " Hot glass looks EXACTLY like cold glass".
Bent a nice star shape, set it down on the bench, then proceeded to pick it up by what I thought was the next to last bend- wrong!
No more fingerprints for a couple months.
Consider the history of the part before touching.
Sam.
I'm sure this will apply to metal parts that have been worked with a lot of friction or heat.
I found out the hard way about the adage " Hot glass looks EXACTLY like cold glass".
Bent a nice star shape, set it down on the bench, then proceeded to pick it up by what I thought was the next to last bend- wrong!
No more fingerprints for a couple months.
Consider the history of the part before touching.
Sam.