what is wood patina?

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Description : When A bronze statue develops a green coating (patina) over time is physical change or chemical?

Last Answer : This is a chemical change.

Description : How patina formation is done. 

Last Answer : By injecting low excitation current of 50 Amps for half an hour interval to 250 Amps. (Epoxy insulation in the stator winding absorbs no moisture). 

Description : How to Patina Copper

Last Answer : How to Patina Copper Patina is that tarnish coating that develops outside metal, like copper, over time. Not only does it add an attractive appearance to copper, but it also provides protection to harsh ... egg. Once you've reached the desired patina coat, rinse the copper pieces in lukewarm water.