When the upper limb is raised, and the pressure cuff inflated, blood flow to the forearm is stopped, and the hand when the upper limb is raised, and the pressure cuff inflated, blood flow to the forearm is stopped, and the hand

The hand will turn very pale.
The reason why our hand had a pinkish color is that of the blood circulation that located underneath it.
When we inflate the pressure cuff, the hand would no longer receive the blood circulation, this will make the color of the hand become really pale.