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We did this in the lab at Uni with proper ventilation. It involves NaOH for de anodizing, HN3 for getting rid of the alloying materials left on the surface from deanodizing (pic 2) and then H2SO4 for the anodizing bath.
We tried a couple of different colouring methods. And the seat post was done proper anodizing colouring, which definitely shows!
Timing is quite important so that you don't remove too much material because the NaOH will just eat away at your aluminium until it's gone.
And get a proper current supply. It takes quite a bit of amperage and this one just shut off if you get a short instead of electrocuting you, which is nice.
I also found this video
quite informative in regards to the process, not the science.
Last picture (in the pot) is sealing the anodized and coloured parts in 97 degree C demineralized water.
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MisterMikkel
Process pics plz!