i am sorry do you mean the yellowing or the greying over time.
the yellowing is a chemical reaction and is a problem every white leather faces over time
the greying is mostly evident with clemence (if i think of the same thing like you) as microdust setlles in between the bumps and therefore leads to a duller greyer appereance. but that can normally be cleaned
Ooooo ..... I learn something new today! Thank you, lilach. With you, HG, Grands Fonds, hello, DQ, orchids (sorry if I missed anyone) ... this H sub-forum becomes a power house!