Okay, so I just thought of this great trick all by myself and though it is so simple, I was really quite tickled with myself. My kids LOVED this and that made my day. Just thought I'd share the fun.
MAGIC Halloween Milk:
* Use a clear cup.
*Secretly add two drops yellow food coloring and one drop red.
* Hold the cup so your kids can't see the food coloring.
* Pour the milk. As it comes out of the carton it is white and as it hits the cup it magically turns orange. Fascinating!