TIP: JameyLynn at Howacoglass.com sells Double Helix by the rod! So if you want to try a color from Amy's chart but don't want to buy a whole 1/4#, that's the way to go. She has the Reduction colors separated from the others on her Double Helix page so you can try them all.
And... She's running a sale through Thursday night. Type in Friday as a discount code and get 10% off!