cobalt pigment

Prepared (V1) 10 g HAc + 20 g H2O. 

Put 2+2+2+3+2+2 = 13 mL of (V1) on the filter paper of (ME96).  Eventually started bubbling but then stopped.  Some blue liquor was still impregnated in the paper and became black.  Final filtrate (ME97) was clear wine-red liq, ppt (ME97) was brown black. 

The (ME1z) suspension would not settle; still light peack cloudy.  Added 1 mL HAc.  Tried to boil in large erlen but had to stop because of explosive boiling.  The heavier ppt grains became pink.

Added 1 mL H2O2 30% to (ME1z). No reaction immediately, but in time the color changed to white cloudy with only a very slight pink tinge, and most of the grainy ppt dissolved.

Filtering (MEF1g), the blue liquor extracted from carbonates by (H1):

* filtrate (MEF2) two phases: (dark blue clear liq) + (clear white supernat).

* ppt (MEF3) brown.

The filtrate (MEF2) developed a black ppt in suspension.

Washed (MEF3) with 2 mL (V1). 

Test tube (ME1zp): 1 mL (ME1z), 0.5 mL citric acid sol: no obvious immediate change.  Lost the peachy tinge? After ~2 days: (clear white very sly. cloudy liq) + (very small amt of white ppt). Dumped liq in (MF0); discarded the ppt.

Added 3 mL ethanol 99 to (ME1xa), and 3 mL ethanol 46 to (ME1xb).  All blue color disappeared from both.  Formed a black ppt that stuck to glass, and a clear white liq.

Finished washing (MEF3) with water into (MEF4); very very light blue clear.  Added HAc, Na2CO3 sol, until stopped bubbling; slightly milky.

Washed (ME96) with water.  Reddish clear wash added to (MF0).
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