aluminum content

[mrbeans]

Ok I know one of you anodizing wizards will know the answer to this question.

What type of aluminum sulfate is required to adjust the aluminum content of the acid solution. does it have to be lab grade or will a agricultural grade work. In general i need to know what charecteristics to look for or can I compensate for a lack of aluminum content with higher amperage. All of the supply places i have found that carry it have a few different types verying from $270 for 2.5kg to the stuff like at $38 for a 2.5kg tub.

thanks in advance

Jeff

[sswee]

Using CC, I see no need to adjust the aluminum content of the solution. Titration to find acid and aluminum content is primarily a concern for CV anodizing. It's one of the benefits to CC anodizing. The voltage varies to compensate for the fluctuations in these parameters. Hope this answers your question.
SS