Ha. I guess you're right. I meant colored dust black in general, forgetting that anodization is only possible on aluminum. editing.
Since I spy a ninja... I searched (and failed) for an answer to this question. If you were using ULT vs RT on/off, would you use different outputs.
If you figure out how to anno a stainless steel valve, Let Me Know! I've checked "blackened" SS and it's expensive. Powder cote , teflon,