[MK7a]: gray wet ppt.  Was some supernat treated with HCl.

Merged (MK10) into (MK9). Both are very light blue powders (SiO2?).

Discarded the white ppt of [MK18c].

Merged (MK1ab) (blue silica?) + (MK9) + (MK10) + (MK7a) in erlen (MK27).
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Dumped [Mk7b] (black ppt + light blue supernat) + H2O to erlen (MK28) (olive brown susp).  Added 8 mL HCit 58% sol. Result: brown susp.

Filtering (MK18):
* (MK18l)dark pink liq.
* (MK18p) ppt brownish translucent fibrous; may be paper fibers.

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Prepared another batch of HCl 20% from HCl 37%.  To each gram of HCl 37%, one must add 0.85 g H2O.

  Cooled HCl 37% and empty bottle in ice bath.
  
  Added 101 g HCl 37%, 85 g H2O 
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Added 2 mL HCl 20% to [MK14a].  Originally gray blue ppt, treated with glucose, now brown ppt.  Turned into pink sol, with ppt of mold.

Added 2 mL HCl 20% to [MK14b]. Same origin, but with NaAsc instead of glucose. Darker orange solution.

Filtered (MK1d):
* supernat very sly pink, added to (MK25)
* white sandy ppt, added to (MK27)

Discarded [FR2] [FR3] [FR1] (had dried up).

[FS4] (iron acetate) had dried to dark orangish black solid. Added H2O. Redissolved almost completely to clear dark orange liq.

[FS5] (iron lactate) still dark yellow solution.

In [FOX1] put 1 g FeSO4.xH2O dissolved in H2O. Milky light yellow solution.  Added ~4 mL H2O2 dropwise; lots of bubbling, turned into orange-ocher suspension.
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