The only other stain I found in Bancroft & Stevens is the Aluminon method
(Irwin 1955) for methacrylate embedded tissue. If you are interested, I
could send you a copy of this page. 
It uses Aurin tricarboxylic acid (aluminon), but I don't know, if this dye
is available.

> Is anyone familliar with the staining of aluminium in slides. 
> Up to now I
> found old techniques in Pearse like "Solochrome 
> azurine/cyanine methods for
> aluminium". I found a supplier (ICI), but they don't produce 
> this chemical
> anymore. Does anyone know other suppliers, or do you know 
> other techniques?