Ugnaught Variant

You will see Ugnaughts come in aprons of various shades of blue to purple. This is fairly contentious topic. The general consensus is that they were all originally a deep blue, all the other shades are just due to degradation from time and exposure. Some will contend that they opened a purple apron Ugnaught off the card when they got it as a kid in the 80's - but is this a true memory or just another example of the "Mandela Effect"?