Colour anodising of milled aluminium parts, two shades

I have a set of milled aluminium parts for a device I am building myself: a housing, two covers, several standoffs and a handle. Right now everything is bare metal — it picks up fingerprints, goes grey in the hand and collects scratches every time I take the unit apart. I would like a hard, durable finish instead: matt, with no gloss, dark grey on the housing, covers and standoffs, and one bright colour on the handle so that it stands out when I reach for it.

The tone has to match across the batch. The housing and the covers sit edge to edge, so half a shade of difference will be obvious to anyone who picks the device up. I understand that the alloy decides most of this: the parts came from plate, but if anything in the box turns out to be a cast alloy with a high silicon content, the colour will come out dull and blotchy — please tell me before the bath, not after it, and we will decide what to do with those pieces. I also want to agree dimensions in advance: the coating adds a few microns per side, and I have bearing seats and threaded holes that I am ready to ream or chase with a tap, but only if I know beforehand. The racking points will leave a mark, so show them on a sketch and I will pick a face that is never seen.

One more thing I care about: acid baths and current are not a garage job. The work must be done in a proper shop with extraction, protective equipment for the people doing it and lawful disposal of the spent solution. I am not looking for anything improvised.

What I need:
— deburr the edges and prepare the surface for a matt look;
— mask the threaded holes and the bearing seats;
— anodise one trial part first and get the tone approved by me;
— run the batch in two colours, each consistent across its group;
— agree the location of the racking marks and the coating thickness;
— pack the parts separately so that nothing rubs in transit;
— quote a price and a lead time for the final part count.