The bottle of stuff is probably dry chem powder.

Carbon dioxide units are BC rated. And the don't
do very well on either of those. Carbon dioxide
units are checked for fill, by weight. The tag
should say the empty and full weights.

Their only advantage is that they are relatively
clean. No powder to sweep and mop up.

Disadvantages include heavy, noisy, and might not
put out the fire. So, no powder to clean up and
also no vehicle or building cause it burned down.

..
Christopher A. Young
Learn about Jesus
www.lds.org
..

On 9/15/2013 8:11 PM, micky wrote:

I think the guy who gave me my first FE also recommended a thing that
looks like a vinyl ketchup bottle, all red, with a screw on pointed
cap with a hole in it and something inside. He keeps it in his
kitchen to sprinkle on small fires.

Also the CO2 extinguishers are probably testable. IIUC a short
squeeze of the handle only puts out a little, and CO2 ones are bigger
in the first place. But I've never had one. For one thing,
they're more money, take up more space and they aren't ABC.

I forget which letter is missing, but it seemed important.