Good afternoon everyone! I have decided to dip my toe into the pool of patterned steel, and I have a question..... I am planning on using ferric chloride but I would like to know if you mix it with water or just use it straight. This is the product I am planning to get but it says “ready to use solution”. https://www.mgchemicals.com/products/electronics-prototyping/copper-etchants/ferric-chloride/ Any guidance would be very much appreciated. Thanks a lot for your advice!