How do you dye yarn?

I bought a few skeins of this tussah silk yarn in "natural" (thinking I'd dye it) and of course! lol (I don't know how! lol).
Can I use kool aid to dye silk???? Is kool aid really an effective dye? (can yo
u use food coloring as a sub. for kool - aid????)
Also...... How do you get pretty/ multi hues like yarn in the pic???? Any tips for that???? Thanks!
Any tips etc. from experience yarn dyers APPRECIATED!
