I've been spinning my turmeric-dyed silk hankies, and it's been going really well. The yellow is so sunny and vibrant, even if it does still smell a little of Asian cooking.
I did mention, briefly, in my last post, that turmeric is not a very colorfast dye. In particular, it's not lightfast - something I learned firsthand after foolishly leaving my skein of yarn by the window for about a week...
A splotch of my yarn has faded from striking bright yellow to a dingy pastel. Lucky for me, this will just add to the hand-dyed look in my knitted object - BUT, if that's not the look you're after, keep your turmeric-dyed items out of the sun, or use a different method of dyeing.