[Inferno]

Hello, I have been plating fasteners to start out with. I was wondering the cause of dark circles on my zinc plate. I am plating with a 300mamp supply with a surface area of about 12. My plate is smooth, it just has a few spots. Is this do to poor agitation?

Also, I am having issues with the yellow chromate it is not sticking. When I rinse it in distilled water after the chromate dip alot of the chromate washes off. What am I doing wrong? The chromated parts have a fresh plate.

Thanks.