With a candy board, we are taking granulated white table sugar and adding just a little water to it and a very small amount of vinegar. The reason we use this mix is quite simple. A small amount of water will dissolve some sugar.
Place the 16 lb of sugar in a bucket. Mix a tablespoon of vinegar into three cups of water and slowly mix this into the sugar using the spade. You can use a sort of digging and then stirring motion and try to get the entire sugar volume just a little damp.
We add a little vinegar to the solution so as to acidify the candy. Lower pH solutions inhibit the growth of mold in the candy board in winter. This is useful as it avoids the bees being exposed to fungal mycotoxins.