Standard mixture in Scandinavia for oxalic dripping is:

75 g Oxalic-2-hydrate, 1 liter water, 1 kg sugar.

Use 20 to 35 ml solution for each hive depending on the size of the 
treated colony.

http://beeman.se/research/oxalic/oxalic-0-nf.htm
http://www.entom.slu.se/res/bi/proj16b.html

-- 
Regards

P-O Gustafsson, Sweden
http://beeman.se

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