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I use my purple side( that color seems to match mine after it is wet & slurried) I wouldn't call it blue. :shrug:
I use it after the 4K Norton ,,, slurried first,,, then water only,,,, jump to the...

I use it most of the time when I finish with the coticule,,, I use it after the 4K Norton,, skip the 8K ,,,then finish with the coticule.