Hi Van - the ol' memory isn't what is was - but I seem to remember when I first started playing with sugar solutions - that, yes - on cooling, heavy syrups did 'plate-out' a thin layer of crystals at the bottom of the container. I then took to adding a small amount of citric acid to the syrups as they cooled - sorry, I forgot to mention that step - which inverts a small percentage of the sucrose, thus preventing crystallisation. We're not talking much - a quarter of a level teaspoon in half a gallon - that kind of quantity. A splash of bleach or vinegar would do exactly the same job - I just happen to always have a big tub of citric acid handy. Which reminds me ....
I don't remember ever posting about the sugar experiments I did back then ?
I was looking for an alternative to damp-set crystallised sugar and/or fondant - something approaching 'medium hard fudge' perhaps, and started-off by boiling-up syrups to precise temperatures and seeing what resulted on their cooling:
No prizes for spotting that the level of HMF, although still fairly minimal, rises as the syrup temperature (a function of the length of boiling time) increases.
What really surprised me, however, was the effect of adding just a small amount of citric acid to the mix:
In the bottom (plain sugar) samples you can see the cavities created as the solution cools - just as when casting metals - but note the complete absence of any crystal structure in the upper samples, which were heated to exactly the same temperature, and thus have exactly the same sugar concentration as the bottom samples.
The consistency of those upper (partially inverted) samples may be more obvious in these shots:
I'd describe it as a semi-hard rubbery gel - which I'm sure could have some kind of future in beekeeping (maybe ?), but it's immediate application wasn't that obvious to me, so I pulled the plug on any further work.
Hope somebody finds the above to be of at least some passing interest. My apologises to the OP for hijacking the thread.
LJ