[sage]

Actually this wasn't difficult at all. Sorry I asked.

I made two very small new batches of acid to the 3:1 and 2:1 ratios specified by Caswell for thier old and new LCD processes. "Battery acid" as I find out now is pretty standard at 19.2% by volume, 35% by weight H2SO4.

I then measured the specific gravity (s.g.) of the two samples with a cheap Hydrometer available at any auto supply place.

Just so eveyone is aware, the Caswell LCD solution which is a 3:1 mixture of battery acid and water and is apparently 4.8% by volume H2SO4 measures about 1075 s.g..
The original Caswell solution which I gather was 6.4% H2SO4 by volume and a 2:1 water acid measures 1100 s.g.

To back up these test results I found the data on the internet for sulphuric acid from Sulco Chemicals, an acid manufacturer. They listed various acid percentages against their s.g. The s.g measurements I made coresponed pretty closely to the percentages I new I had and their data.

Now it was a simple matter of returning my acid to the 1075 s.g by adding water which means it is back to the LCD spec of 4.8% by volume and 3:1 mixture.

Simple and cheap.

Sage