Add 100 ml of distilled water to each of the beakers.
Add 1 ml of the appropriate premixed stock solution
(mixed in previous step) for the chemical
you are working with and mix with the distilled water already
in the beaker.
Be sure to make control beakers to run along side
your insecticide beakers. Follow the same steps as above but do
not add any chemical other than 1 ml ethyl alcohol to the beaker.
It is a good idea to let the beakers 'breath' at least
10-15 minutes before use, to allow the alcohol to evaporate from
the beaker.