Maybe it is just a shadow but it looks as if Steffan Mengel's blade has been altered to make the handle a little thicker. It looks like the handles were removed and another piece of wood glued to the blade and then the handles were reattached.
On my computer monitor, Boll's blade is the normal ALC color.
Also, the one time I boosted T05 I didn't much like the effect (probably I over-boosted it), so never tried it again, the stuff is too expensive to experiment with. I don't think my unboosted T05 looked different on my blade than Boll's. It is not obvious to me that his is boosted. Now, the rubber on Hielscher's ancient blade, that one looks definitely to be chemically enhanced. Also the MD initials, indicating it was sealed by the Belgian guy.