105 grams Oxalic Acid crystals
750 ml hot water from tap
3 x 750 ml (2250 ml) 2:1 sugar syrup
Small digital scale
Plastic sandwich bag
2 x 750 ml honey jars and 1 lid
Bucket with handle and lid
50 ml syringe
Using a small spoon, measure 105 grams of oxalic acid into a plastic sandwich bag on the scale. Carefully pour the oxalic crystals into a clean 750 ml honey jar. Half fill the jar with hot tap water. Tightly screw the top on the jar and shake vigorously until the crystals dissolve. Then add hot water to fill the jar and shake again. Using another 750 ml honey jar, fill it with sugar syrup three times and pour into a clean bucket. Shake the water/oxalic acid jar again and pour into bucket. Mix all the ingredients thoroughly with a large spoon. Rinse and then wash the jars and spoons immediately in hot soapy water.
Using the syringe, dribble 50 ml per colony between the frames, directly on the bees, when the outside temperature is low enough that the bees are tightly clustered.