After talking last night of things yellowing over time, with reference to the apple core, here is the tone knob for the neck pick up from my first ever electric guitar. It used to be bright shiny white but has now mellowed to this creamy yellow colour. It has always fallen off and was actually lost for a while. I thought I had fixed it but as I was playing it this evening and the darned thing fell off again. Pass me the araldyte! Oil on gesso 16cm x 12cm.