I didn't realize that everyone was waiting for Wilton icing colors/dyeing instructions! I don't have my original PM to Flor, but here is an expanded version of playsilk dyeing.
Microwave directions: Mix Koolaid and 2 cups water, add splash of vinegar. Less koolaid=lighter colors, more Koolaidr=more intense colors. Place play silk in freezer ziplock or glass bowl, pour koolaid over it. Microwave for 2 minutes, rearrange silk if you want, microwave for additional two minutes, let it cool a bit, rinse in cool water. Hang to dry or put in dryer with a towel, using the dryer means less wrinkles and softer silks.
Variations - use food colors instead of koolaid; soak silk in vinegar solution then squirt/paint colors on, then microwave. To use wilton icing colors, dissolve the paste first in a cup of warmish water. Some colors take longer to dissolve than others so check the bottom of the dye solution.
Advantages - fast for a few silks, neat designs. Easy for everyone to do their own thing. Disadvantages- slower for lots of silks, colors are uneven, silks can catch on fire if they dry out, bags can leak.
Stovetop - Bring pan of water to boil, I use a 6 quart dutch oven. Add two glugs of vinegar to pot. Mix Koolaid in 1 cup water, add to pan. Add silk, stirr occasionally until it is the color you want. Pull it out, let it drain a minute, rinse in cool water. I use a wire colander to drain over the pot, transfer the silk to the faucet, and then to rinse. Dry as above.
Variations- Same as above. Also dip dyeing, when you put just a part of the silk in the dye pot.
Advantages- Even dye coverage, easy to do several silks at once and remove them at different times for different shades. Best method for really dark, rich shades. Disadvantages- Takes longer to do a few silks as compared to microwave, not kid-friendly.
Hot tap water - Put koolaid powder in a ziplock bag, add silk, add hottest tap water. Mix around. Let sit for ~20 minutes. Open, dump and rinse.
Advantages - Super kid friendly, I've done groups of 25 kids this way. Disadvantages - You get what you get, you can't control the color or the design very well.