I just found out that the water base Hunt Speedball printing ink comes in
large cans, but you might have to order it. One of my wholesalers had it
but the other didn't. they should be able to special order it from Hunt.
This is much more affordable than the tubes but you'll have to moniter
their use. Tongue depressers are the best way to get it out and unless the
kids are older, I wouldn't let them help themselves.
I bought ink in lg. tubes and use a caulk gun to distribute.