It's corn sugar.
White table sugar is not as good because it's sucrose. Corn sugar is fructose so it ferments more quickly and cleanly. Another option is to make invert sugar out of table sugar, but if you can get corn sugar, that's definitely easiest.
Oh don't give me none more of that Old Janx Spirit
No, don't you give me none more of that Old Janx Spirit
For my head will fly, my tongue will lie, my eyes will fry and I may die
Won't you pour me one more of that sinful Old Janx Spirit