Sure, I got this recipe off a woman named Meg here at MDC a few years ago:
For each color:
1 envelope unsweetened Koolaid
6 oz water
2 oz white vinegar
1 microwave safe baggie
Soak your silk in warm water about 20 minutes, stirring it to get it really wet.
Put vinegar, water and kool aid in baggie. Wring out silk and add it to baggie. rroll around so silk is covered by liquid. Put in microwave for about 2 minutes (watch for explosions)
It will be HOT when it comes out- use a towel to squish it around in the bag. Squish until the water turns clear or almost clear. You might need to put it back in the microwave for about 1 minute at at a time. Allow to cool in baggie and then rinse with cool water until it runs clear.
I am sure there are a dozen different ways to do it, but I liked this method best of what I've tried.
Good luck!
Laura