DDR,

You can probably do it, but it will be messy, time consuming, expensive, and the results won't be all that great. I know that any time you are trying to get something from 'colored' all the way back to 'white', it seldom works.

Rather than spend the time and effort to try to change the color, I'd think that with access to the internet and some digging you could find the right size and color of cord. May not be able to walk into a store and buy it, but it's out there. Certainly would be cheaper, and probably faster, too.

Buddy