The ice cube on f102v

[Jorge_Stolfi]

There is definitely blue salt

But there is evidence that the colors were applied only after the book was bound, and that the binding was arranged by someone who could not read the text -- implying that the Author was no longer around.  

Therefore, when analyzing the images, one should ignore the colors as distracting noise.  For the Author, that brick was just an unpainted outline. 

All the best, --stolfi