vial and place in glass-stoppered bottle. Add appropriate amount
of distilled water to make 2% solution. May take 2 to 4 days to
dissolve in warm water bath. Store in closed container in refrigerator
and only use with acid-washed one-time use pipettes to
avoid organic contamination. Will blacken and discolor when no
longer good from very initial faint yellowish color. For 0.2 M Scollidine
stock buffer: 120 ml distilled water is added to 5.34 ml
purified S-collidine, and then 16 ml of 1N HCL is added. Volume
is adjusted to 200 ml with distilled water. Store in refrigerator.
For working solution: add appropriate volumes of 2% OsO4 and
0.2 M S-collidine buffer at 1:1 ratios. Can be stored in refrigerator
until discolored.