I've yet to do any ppm measurements when I make colloidal silver!
I know that's not very scientific, but neither is dropping a couple
silver coins in a jar of water to keep it fresh, as they did in olden
days.
I buy my H2O2 from walgreens, again not very scientific, sorry!

I'm just a modern primitive who tries to eat as little phlegmy, gluey
food as possible (what bugs feed on). The less gunk you ingest, the
less the bugs have to eat, the less hard your immune system has
to work, and the less you get sick; also very important to get all essential
minerals. Our soils are over-farmed and therefore deficient. People eat
modern fast & packaged foods and bad combinations that have little
nourishment but lots of gluey properties. See: Rational Fasting and
The Mucusless Diet Healing System by Prof. Arnold Ehret; also
Cleanse & Purify Thyself by Dr. Richard Anderson, Cure for All
Diseases and Cure for all Cancers by Dr. Hulda Clark. OK,
that's more than you asked for. I only mention because all have important
information mostly missing from mainstream culture. All medicines are
essentially palliatives. Food and fasting cures everything and leads to
spiritual revelations, real communion with living spirits. (Death is an
illusion.)
Just add a shotglass or two of h202 to a liter or two of water. Add your
silver wires and zap away. When I see a color change, I know it's done.
It usually gets darker with age. I've got stuff years old 'cause I'm never
sick enough to need it. I strongly believe it will prevent or cure the bird flu
since it does everything else. It's a specific for AIDS. See all US Patents
by inventor: Marvin S. Antelman