I am a life long doll collector and this is the first time I have ever had to deal with this issue. I still have my dolls from childhood and the nearest I have come to this issue is that the lip paint has oxidised on two of my Sasha dolls!
I wanted to use one of body's from one of my CH dolls recently but was horrified to see how yellow it had turned!
I might have a go at sanding and bleaching that one though.....as nothing ventured nothing gained!
But I don't like how our beloved dolls are changing colour over time!