I use both anhydrous granular citric acid (Citrex) and Sparex (not
together though) depending on what I am doing. I really like the Citric
Acid for most everything. I bought mine from a little chemical company
that sells mainly pool and spa chemicals. It happens to be food grade
which a better grade than one would need, but it is the easiest to find
and is actually cheaper than regent. You might try a food service
supplier as it is commonly used in the food industry. The smallest
quantity this company carries is 50 lb. at $1.50 per pound. I split it up
and shared it with local Guild members. There has been a favorable
response to its use.
I use it very hot (crock pot on high) and in the strongest saturation
possible. However, a typical mix is about two cups to a quart of water.
If you use it at a high level of saturation, you may find that when it
cools overnight some of it will come out of solution. Not to worry, it
will go back into solution when heated. After pickling in it, you can
neutralize as usual, but whatever your method, make sure to rinse it off
thoroughly as it can get sticky. I am very pleased with its performance,
and as long as it is quite hot it works very quickly. I always use an
exhaust system, but it is less harsh than Sparex, and I no longer get tiny
holes in my clothing from hot quenching.
From a peaceful little farm near the Columbia River, with a view of Mt.
St. Helens and Mt. Hood. And, on a clear day, Mt. Adams and Mt. Rainier.