I think I'll just try one or two fading methods with stuff I have in the house .......
I've got;
Coconut oil
Jojoba oil
T-Gel shampoo (brutal stuff!)
Tresemme clarifying shampoo
Some rather old head & shoulders
Bicarbonate of soda
Lemon juice
Honey
Vinegar
Can probably cobble something together out of that lot

..... not sure what mineral oil is tbh, is it the same as baby oil? Think I saw some the other day.