Picked up a 50lb bag of "Baseball Marker" another name for Calcium Carbonate. It is used to mark baseball feilds for games. I got the huge 50lb bag for $16.25 with free shipping to my home. Much cheaper than buying it by the itty bitty bottle from a chemical or photo supply store. I will use this stuff to wash my Ultra Large Format ambrotype plates.
Update* The 50lb bag was on my door step today when I left for work. Got to love FREE DELIVERY on an item like this! I only had to carry it into the house.
