So, here i am searching around for more information on syrup for bees. We only have 3 and a half litres of honey harvested recently from the wild hive we boxed (now it has split into 2 hives). The original hive has some stores, the second is going to need a lot of feeding. On a natural beekeeping site (biobees) i saw instructions for making liquid invert sugar syrup by carefully boiling sugar, avoiding all carmelizing (toxic!), and adding 2 and 1/2 teaspoons lemon juice to 2 and 1/2 quarts water and 5 lbs pure cane sugar. Boil 20 min. stirring lots. It breaks the sucrose into glucose and fructose, while some sucrose also remains unaltered, so you get a syrup with all three sugars. Much longer shelf life, more like natural nectar - sounds good. This blog page http://wvbeekeeper.blogspot.com/2008/01/making-invert-sugar-syrup.html had some more info and a different recipe. But on this page http://www.scientificbeekeeping.com/index.php?option=com_content&task=view&id=52 the author said "hydroxymethylfurfural (HMF)... forms from fructose when an acidic sugar solution is kept at a warm temperature for any length of time... HMF is harmless to humans... however is toxic to bees" Hmmm. Does the acid in the recipe create enough HMF to be detrimental to the bees? People using the recipe seem happy, but the are so many factors always in play, maybe they haven't noticed there is some detriment. Maybe it would be better to use less of the acid, and boil longer, but i don't know if that would lead to the same about of sucrose being inverted. Still hunting around for more info. Or you can buy invertase - but not where i am, and i don't know how much it would end up costing you.