I've made candy apples before (& made plenty of hard candy in my time too) but it never occurred to me to do them like this.
One word of caution, this is not a kid friendly project. That is 300° molten sugar, not something the little ones should be helping with.
I'd also like to mention that you need to move kinda quickly with this since it does harden up quickly. You can put it back on the stove to melt it a little more but not for too long or you'll scorch it.
Also if you live in any place that has high humidity your candy will just not set up correctly so if you're experiencing 90°+ temps with 70% humidity like I am, you might wait to make this.
Those do look awesome! I don't think I've heard of white food coloring. Is that a paste? I love the glossy look of the coating on the apples.
I've made traditional candy apples before and it can be tricky if you're not careful and not paying attention. While I like the cinnamon flavored ones, I kind of liked the softer caramel apples over the hard candy ones. But the candy coating on those just looks so good!