Mate, it's a piece of piss.
Buy 2 little tubs of Dylon multi purpose dye from somewhere like Woolworths.
Get a Saucepan that will comfortably accept the seat and be big enough so that the seat cn be full immersed.
Fill the pan with enough water so that it will cover the seat when you put it in. Add approx 400g of alt & stir and get it to a temp that it is steaming but not bubbling. Remove the seat guts and gently lower it into the water. Leave it for 5 minutes with just the salty water and maintain the temperature so it is steaming.
After 5 mins carefully add the dye, it's black powder so be careful it can go anywhere. Gently stir making sure you do not bash any gold on the seat, because this is the only thing that can go wrong. You may prefer to remove the seat, to mix the dye in.
Every 5 mins stir the liquid, and I normally move the seat so that any points where it comes into contact with the pan get covered, as you may get spots of the colour showing through. The easiest way to lift the seat is to use a set of grips on the rails.
Repeat stirring etc and simmer for about 40 mins. When you are happy that the seat is done, remove it and take it over to the sink. Run it under the cold tap to cool it down, and harden the gold lettering. If it is a Kashi aero, you may want to smooth the Sticker at the back down before running it under the tap. When everything is cool, rub the seat down to remove any surface dye, cos you don't want a black arse. You will probably notice that there are glossy bits on a Kashi, which you may not have noticed before. They are all like that, you just notice it more when the are black.
