Blastattack
CGN Ultra frequent flyer
- Location
- Winnipeg MB
I have black anodizing done all the time locally for billet motorcycle parts, when I've mixed parts made of 6061 or 7075 the colors still match as long as they are done in the same anodizing batch. The only problem I ever had was with different batches of anodize, and that is what I believe your problem is here. I assume that their uppers and lowers were not anodized in the same batch of anodizing
In my experience with anodize as the chemicals get old, they don't produce as black of a anodize as when they are fresh so the parts start to come out a little dull more on the gunmetal grey side not so dark black
So since experiencing that I have always tried to bring my parts to them when they have just refreshed their dyes so I get a really dark black finish, and always try to have all the parts for one job done in one batch.
Another factor is the type of finish that was used on the aluminum prior to anodizing, personally I like a glossy look so I polish the parts prior to anodizing. Some of my customers like a matt or flat finish so for that I use some type of media blasting or tumble finish prior to anodize and that will change the sheen on the anodize. So there could also be changes in the media and the finish of the aluminum prior to anodizing, thing wear out or get changed to another brand or supplier
For example here are parts some are 6061 some are new some were old some were even stripped and re anodized another color
All are pretty much the same color except for one part in the middle left, that is because the customer wanted a flat finish so I media blasted that part prior to anodizing and it came out flat
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Are those regular anodized or Hardcoat anodized? Regular anodizing in black is generally very consistent, but hardcoat has substantially more material growth, and therefore visuals can vary dramatically.