Added 2 mL (OX2) to (MK31a).  No immediate reaction.

[MK29c] small amt CoC2O4 (pink white susp) + drop of (H5') (NaOH 15%).
The ppt turned blue with clear white supernat.  With 2 drops, ppt turned pink-gray.

Merging [MK29a] into [Mk29b].  Layers of ppt in test tube: from top to bot, clear pink liq, pink ppt, blue ppt, pink ppt, blue ppt. After mixing and heating: pink susp in clear white liq.

Merged (MK18e) (clear red) into (MK25). 

Starting to precipitate all cobalt as hydroxide.

(MK31a) (reddish tea clear, maybe lots of iron): added 14 mL (H1) (NaOH 50%).
The pH changed from < 5 to > 12 but there was no ppt.  The color only became darker tea.

(MK25) (cobaltred clear): added 4 mL (H1). Blue ppt formed immediately, pH 4.5.

Merged [MK29c] into [MK29b].

----------------------------------------------------------------------