Two small samples of ppt (MC8), about 4 mm diam and 0.5 mm thick, were placed in test tubes.

To sample (MC8a) added ~1.5 mL ofacetic acid glacial.  Slowly developed pinkish hue, but the flakes of the (MC8) ppt did not even disperse.

To sample (MC8b) added ~1.5 mL of lactic acid 85%.  Vigorous bubbling.  Flakes of (MC8) disintegrated.  Slight pink color developed and liquid became cloudy.

Heating the suspension (MC7) to boiling.  Fine black ppt in suspension.  Filtered with 28 um paper, yielding (MC9) clear blue liquid and (MC10) black powder ppt.

Filtered (MC2) with water washing yielding (MC11) pink clear liquid and (MC12) lilac ppt.

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