When I was growing up, if I didn’t want to go outside in the rain, my dad would say, “Go ahead, you won't melt." Then he would add, "But you might dissolve. Sugar melts, but salt dissolves.”
As I was reminiscing about this to my 9-yr-old, I said, “My dad was saying that I wasn’t sweet enough to melt.”
My son said, “It sounds to me like he was saying you weren’t even as sweet as the Wicked Witch of the West.”