I used to do the same thing-- buy bulk spices from an Indian grocer. Now, I don't, because a lot of our imported spices can have lead in them. Not to be alarmist, and I wish it weren't true, but it's worth mentioning here since lead toxicity in chickens can.. well, look like Marek's disease! : https://preventdisease.com/news/10/032210_indian_spices_lead_poisoning.shtml
http://www.astaspice.org/the-american-spice-trade-associations-statement-on-lead-in-turmeric/
There are many other sources that indicate that spices, including turmeric, have been found to have varying levels of lead (sometimes quite a lot) but I don't want to spam them all here. Google "Turmeric lead"
Turmeric is thought to be beneficial however-- plus, I like cooking with it, so I started to grind my own. It's not too hard, fortunately, and all it takes for the amounts I need is a cheap coffee/spice grinder. http://www.freshbitesdaily.com/homemade-turmeric-powder/
this is ridiculous! its a crazy world out there, and so aggravating when you are trying to do the best thing and find you have unwittingly possibly made things worse. geesh.
Thank you for bringing this to my attention, I was totally oblivious to the lead danger.
Are you giving your handground tumeric to your flock? or using it solely for your personal use? if you give to the chickens, I'm curious about the doseage you are using.
Off to research whether I can test for lead in tumeric easily or not.....I know there are home lead testing kits.....