I am trying to make sugar ice cubes and I keep getting air bubbles.
I am using a silicone brownie mold for the cubes.
I boiled 1/2 cup sugar and 1/2 cup light corn syrup to 250 degrees.
Then I poured it immediately into the molds.
What did I do wrong?

Also, try pouring your sugar high and thin... Not sure if that makes sense but hold the pot or whatever you're pouring from as high above the brownie pan as possible pouring a thin stream of sugar...

I just did poured sugar shot glasses and mini liqueur bottles. It definitely helps to put the hot sugar in the oven (275F) for at least 15 min. and then pour high and thin to fill it 1/4 up, waited a min., then poured the rest. I got fewer bubbles doing it that way compared to when I poured it immediately into my molds.

Melanie Mc.

Awesome! I need to try mine!

I would suggest putting your oven at 300, just to keep it a little warmer. You'll gain longer working time by doing this (25 degrees makes a big difference with sugar). You do need to let it rest for a bit before pouring.

One other thing you may notice is that after you're done, there may be small bubbles on the surface. Silicon releases gas when the hot sugar gets it, which causes this. If it happens, take a small torch and they should go away.