[TheForge] Chemical question

[Saint Phlip]

I need more convenient (and cheaper!) access to a particular chemical,
for more of my dyeing experiments. It's called "Soda Ash Fixer", says
it's Sodium Carbonate, and its use is as a dye activator. Anybody know
what else it might be called, and how I might get more, preferably
cheap?

Thanks,

-- 
Saint Phlip

Heat it up
Hit it hard
Repent as necessary.

Priorities:

It's the smith who makes the tools, not the tools which make the smith.

.I never wanted to see anybody die, but there are a few obituary
notices I have read with pleasure. -Clarence Darrow