Colorization - what was it's purpose?

[Jorge_Stolfi]

[About f67r2] When the red ink (text) was added, the author drew extra lines. You can see that more vertical space was allowed for the red text.

We went through this before...

Sure, the text on that page was written all at the same time.  But in what color?

I cannot repeat here my best theory for how the present state of that page came to be, because it seems that the essential word causes seizures and anaphylactic shock in some people.  Perhaps this clip will do:
   

My second-best theory  is that the red text was written in red at the same time as the brown one -- but that was it.  It does not imply that the rest of the color painting, elsewhere on the manuscript, was done at same time.

Too bad that McCrone did not get a sample of that red ink that could be compared to the red paint elsewhere.

So why not the blue at the same time as well?

Why not at a much later time (as other evidence suggests)?

All the best, --stolfi