Answer:
Forward I am heavy backward I am not. What am I?
My teeth help me suck.
I am black when you buy me red when you use me when I turn white you know it’s time to throw me away.
The more of this there is the less you see. What is it?
Of the king I am blue and of the peasant I am red. Of the frog I am cold and of the dog I am hot instead.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.