please help!!

[fourkbmx]

when i left a piece about 10 min on my caustic soda i had this great mate finish, but i wanted to try a bright finish, so i didn't left the piece in the caustic soda a lot of time, and i saw that in my ano tank it started to grow little black spots and it ended up looking like this. it is only in the teeth, have no idea what i did wrong.
acid 1:3
temp 20C
.7mil

[sswee]

Are those spots in thie pic pits or discoloration?
Cast or billet part?
It looks like a couple of problems I've seen both related to material of the part.
SS

[fourkbmx]

those are spots, cast part

[sswee]

That is what it appeared to me. The problem is from the material and sometimes brought more from the machining process. It's sometimes hard to cover up. I usually strip and refinish the material by polishing or bead blasting then reanodize to minimum time for the desired color. Etching with lye tends to bring it out also.
SS