I was making some test plates coming from the higher voltage
going to lower voltage.
Ahah! Try the other way round.
Start with low voltages, like 15vdc or 20vdc. Then saturate the
metal at that voltage. Depending on the size of the piece you might
get an even brown colour. Then raise voltage by a small bit, like 5
volts, and watch for the colour change. Saturate at that voltage for
an even coverage.
And so on. till you see the colour range as you raise the voltage.
Useful exercise: start with 10 pieces in the anodiser and colour
them all at the lowest useful voltage. Remove one as a sample then
raise the voltage for the remaining 9 till you get the next colour.
Remove one and do the next colour on the remaining 8, etc to get a
If you start with high (80 or so) volts you’ll rapidly anodise a
thick oxide layer that zooms through the afore-mentioned colour range
to the secondary or even tertiary range and they’ll look duller and
duller the higher you go in voltage. See sparks? That’s a too high
What are you using as an anode to touch on the workpiece? Titanium?
Occasionally you’ll need to sand the end of this to remove the
anodised (insulating) layer on this for it to continue to have an