https://www.amazon.com/BRENNTAG-Ferric-Chloride-42-Gallon/dp/B00LOURL3E/ref=mp_s_a_1_12?keywords=ferric+cloride+acid&qid=1571071117&sr=8-12 Available on amazon. I like the blue transfer paper also available on amazon. I use a plastic container and use a sharpie as a resist. Sometimes I use the acid straight other times a 50/50 mix with water. You’ll have to experiment to see what works best for you.