Figures from McCrone Pigment Analysis?

[Jorge_Stolfi]

With respect to the tiny 'object' in Stolfi's second picture, the white bit was looked at and Joe Barabe was not able to decide what it was, except that to him it appeared to be foreign to the MS, i.e. some unintentional external thing that ended up being attached to the MS. He did not like to speculate.

Ok!

The shiny gold-like blob to me looks a bit like similar items found on other pages.

That would be interesting...

suspected to be gold or gold paint

It does not look like that at all.  I expect gold leaf to look angular like crumped aluminum foil, not with round knobs. And to me it looks like the brown hue of an ink trace is showing through the yellow stuff.

they were identified as tiny drops of gum that were spilled on the parchment. This is the gum used to make the iron-gall ink.

I used gum arabic when I has a kid.  It was commonly used to make glue for paper, envelopes, stamps and things like that.  Being edible, it could be licked...

Gum arabic is traded as translucent lumps, almost  as hard as candy.  For use, those lumps are dissolved in hot water yielding a thick syrupy liquid.  That glue is what one would use as binder for tempera paint or thickener for ink. I suppose one could prepare gum arabic so that it would have the consistency of a putty, but I cannot see why.  

But while some large chunks of gum arabic can be orange or rusty brown in color, a drop as small as that object (~0.3 mm) should appear colorless.

I am still betting on egg yolk...

All the best, --jorge