Dear Researchers, Very Good Morning

while I doing anodizing (coloring) on wise lock screw (i.e. pink color) (for orthopedic implant application) of 2000 pieces, by using following parameters (by adjustment of switch A on 2 , Switch B on 7 and voltage 67 to 69).

After experiment it is found that some screw change the color in light pink , some are dark pink and some of them change the color into blue color.

Dear Sir, please suggest me why it is happening? and also suggest that how the same color will be maintained?

Thanks a lot

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