cobalt pigment

Discarded (ME1zk) and (ME106k).

Decanted (MD27) (pale pink clear liquor, pH 9.5, lots of NaHCo3/Na2CO3); merged into (ME106) (ditto).  Left small amt of pink ppt (MD27p).

Heating (ME106). Boiled for ~15 min with silica gel stones to nucleate.  On cooling became peachy cloudy with a small amt of pink ppt at bottom.  Added 1 mL HAc to ppt; no bubbling, but became stronger pink.  Dumped into (MF0).

Added 1.0 mL HAc to (MD27p). No immediate reaction. (Must be silica.) Pink tone became more intense after a while. Dumped into (MF0).

In (MEF2), the small amt of liquid had no blue left; only a suspn of black flaky ppt in clear white viscous liq. Added ~50 mL H2O.  Filtered (MRF2):

* (ME107) liq; clear white.

* (ME108) black flaky ppt (no silica, hopefully).

Decanted the small amount of blue liquor from (ME1a), about 0.2 mL, into (ME1aa).  Left behind grayish ppt with some blue liquor.  Added 3 mL H2O to both.  Became gray syspensions.
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