cobalt pigment

Refiltering (ME97) (dark purplish red clear liq with some dirt specks) with 14 um paper:

* liq (ME98) magenta clear.

* ppt (ME99) very small amt; added to (ME96)

Refiltering (ME90) (blue liquor with ethanol) with 14 um paper (took forever):

* filtrate (ME100) multiphase: (dark blue clear liq) + (white clear liq supernat.) + (bleck ppt in suspension).

* ppt on filter (ME101): brownish black, small amt.

Scraped off (MEF3) (tiny amt brown-black powder) from filter paper and stored in a 1 mL vial.

Put filter paper (MEF3) with 6 mL (V1) in a beaker = (MEF5).

After 1 day, (ME1z) was still partly milky but the suspension was turqoise!  The coarser ppt was still pink though.  Added 1 mL HAc and 2 mL HCit solution.  No immediate changes.  

Acidifying (MD66) (nice medium blue clear liq + very faint white ppt) with HAc. After ~38 mL, blue color of liq disappeared and large cotton-like blue-gray lumps formed.  At ~44 mL (pH ~6.5) a dense ppt formed, white with a slight pinkish tint.  Added 10 mL NaHCO3 sat sol; no difference. Added 2 mL (H1); brought ph to ~8.  Then added 1 mL HAc; brought pH to ~6.5.  Suspension had a pinkish tinge.

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