"RonB" spake thusly and wrote:

I usually combine them

Take care, sometimes chemicals can combine in unexpected ways
to make new things, not all benevolent.

Steve
--
www.sellcom.com for firewood splitters, ergonomic chairs,
office phone systems, "non-mov" surge protection, Exabyte,
CA, Minuteman, Brave Products, Fisch, TMC, Panasonic and more
Check out http://www.guardian.name