wdr (05/02/83)
The favored tube in the article I read was a Golf Bag black plastic insert. I suppose you could make a light-trap valve for solution changing. I don't recall the advocate in which-ever magazine two years ago mentioning a scratching problem or solution. Bill Ricker wdr@security.uucp ..!decvax!genrad! !linus!security!wdr ..!allegra!