"From a Kodak Formulary publication, 1.4 grams of sodium tetraborate, decahydrate (Borax) + 0.3 gram of sodium hydroxide is equal to
2 grams of sodium metaborate (Kodalk) in a litre of solution"
Check out (there was a url link here which no longer exists) in the (there was a url link here which no longer exists). Mike provides the best hands on recipe I have found so far on this subject.