cobalt pigment

Added 14 mL Na2CO3 (16 C sat sol) to (ME11ra).  After bubbling stopped, dirty lilac ppt formed (dirty because of irin content?) Heated to boiling in order to get it to precipitate faster.

Decanted supernat of (ME154): light green liquor (ME160).

Added again ~50-100 mL of (ME107)+(ME132) to dirty filter papers in (ME154), plus 2 tsp of NaOH.  Decanted: blue liquor (ME161)!

Added Na2CO3 (solid and sol) to (ME1ps), until stopped bubbling and prescipitated cobalt carbonate as a purplish brown fluffy ppt.  Heated to speed up settling.

Washed (ME1pt) into filter of filtration ((1)).

Added a bit of NaOH to green liquor (ME160).  Heated.  Remained green but became smokier.  

Washed (ME131) (very small amt of black ppt) from filter paper with H2O, into filter of filtration ((1)).   Chopped the filter paper of (ME131) and added the bits, still partly impregnated with black ppt, to (ME154).

Added a bit more NaOH to green liquor (ME160).  Still no change in color, but maybe a bit smokier.  

Both (ME160) and (ME161) have pH ~13.5-14.  

Filtering the blue liquor (ME161):

* (ME162) liq; clear prussian blue.

* (ME163) ppt; practically none apart from paper fibers and bits. However the filter paper became impregnated with a greenish-brown liq.  Discarded.

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