to that carter kid
paint fades are easy as fuk. my bars were done by harry and tom with paint pen as they said, except it has a really grotty look to it imo.
what you can do, with pretty much any paint available (ill use a spraycan as an example)
spray the whole bars the lighter colour that you have. in the case of my bars, this would have been the yellow.
do several coats of that as you would normally paint bars. when thats done and dry, you want to get your darker colour and go from whatever area you want to fade your bars.
to successfully fade, you want to spray whatever way in a smooth motion, and where you get to the section you want to fade, you should slowly pull the can away from the bars, still spraying so less paint reaches and sticks to the bars. do this severla times in different coats, and then you have faded bars.
remember to clear coat it with a few layers once you're done.
wow, that shits like a mini essay.