I'd never used citric acid before but My Spice Sage had a deal on it so I figured, why not. it makes a great addition to get a lemon flavor in things that you don't want to add liquid lemon juice to. A little goes a long way. I got a pound, I may never need do buy it again, LOL.
I am a professional yarn and fiber dyer. As such I use citric acid powder as part of the dyeing process. When I ran out and decided to check venues other than dyer's sites I found that My Spice Sage had the best prices on the citric acid compared to every place else I tried. I also had the bonus spices they sent and free shipping! You really can't beat this :D