Best anodizing guide?

[JOGARA]

Rarely see suggested ratio by weight, usually by volume.

However, simple enough to figure out an approximation I guess. 3kg of water is 3L, for the sake of simplicity we'll say your 400g of 85% acid is actually 340g (400 * 0.85) and ignore the extra 60g of water, which when considering the specific gravity of sulphuric acid is 1.85 should mean it was about 184ml.

So you have actually got 0.184L acid to 3L water, or roughly a 1:16 ratio which is not too far off what I've seen recommended for 6asf (slightly low perhaps), but more than a little on the low side if using 4.5asf (caswell recommend 1:3 battery acid/water, or around 1:11 acid/water if my maths holds up).

That jives more with what you would expect - too low a concentration will give a smaller pore size which is bad for dying. Were you calculating with 4.5asf or 6asf out of interest?

So I had too little?
Dam it I already diluted half my mix. I got loads of everything so can make a proper batch using fluid measuring.
I didn't account for the acid being heavier than the water. I thought it was near enough and it being 85% I could within range say that it is 100% and the extra weight would offset that xD

I guess this is why I am having problems then...