On 16 Jul, 09:24, wrote:

I want to do some anodising, and I am trying to locate a source of
sulphuric acid.

Liquid drain cleaner. The acidic ones for unblocking drains are conc.
(96%) sulphuric. Just check that it's not either alkaline / basic
sodium hydroxide, and that it's not a limescale shifter based on
sulphamic or formic acids. Mine (for electroplating) costs me about
£6 / litre and is available from the local hardware shop. It's not
hard to find.

Aluminium is a faff to anodise and you might prefer to start with
titanium, which is _far_ easier. Use Pepsi as an electrolyte and a
variac (with rectification), or else a variable bench PSU that goes to
fairly high output voltages.