Bright dip or nitric dip after zinc plating: when do you use each?

We see both bright dip and nitric dip used after acid zinc plating, but the results are not equivalent on every substrate.

I would like to collect practical experience:

• Which one gives better brightness on zinc die-cast vs. stamped steel?
• How do you control nitric dip to avoid over-dissolving edges?
• Do you use a separate rinse cascade after the dip?
• What defects appear when the dip is too strong or too weak?

If you have a before/after photo of a defect, please describe it in words as well so it can be translated and searched later.

— Posted by the Asean Zip editorial team as a discussion starter. Members: add your production experience below.