Never had that problem. Maybe the hair dye was old, and list its umph.
I just dyed a pair of brown scales, black, the other day.
The dye was a little old, so I let them soak in it over night.
They came out, black as night.
Pictured in yesterdays SOTD
I know....what's with the second pivot pin.
I swapped the blade out, for the Wosty I'd had sitting in the tadoo drawer, for the past two years or more.
I had to move the pivot hole, to accommodate the Wosty. So instead of filling with dust and CA, I chose to peen a false pin on each scale, instead.
Attachment 328582