My two colleagues and myself were discussing this last night ..
And thanks for the pictures.. we were using internet pics from various sources..
the colour/ hue seems to differ between the obvious masons marks and the Khufu cartouche. This would be very difficult to see under dim artificial light in situ ..
Obviously this can be caused by different camera sensors/films lighting etc..
We were looking for a set that had obviously been taken at the same time with the same sensor.. same white balance.. colour sensitivity processing etc..
ideally forensic photographs would be of use, but these are great.
if you try to match the red hue in Photoshop CS6 the white balance goes right off the scale ..
It is a good point .. . it may well be a different red.. the cartouche paint is less opaque and has a higher reflectivity ..gloss.. it would need proper analyses to be sure..
Post Edited (16-Jul-14 12:55)