Colorize bash script example while using variables

#!/bin/bash
################################
# GLOBAL VARIABLES IN ALL CAPS #
################################

# Console colors
W='\033[0m'  # white (normal)
R='\033[31m'  # red
G='\033[32m'  # green
O='\033[33m'  # orange
B='\033[34m'  # blue
P='\033[35m'  # purple
C='\033[36m'  # cyan
GR='\033[37m'  # gray

echo -e "$P This $P$B is a $B$G test script $GO$C for colors $C"
echo -e "$P This is purple $GR This is gray $R This is red $O This is orange $P Purple $C Cyan"
echo -ne "This is an example question to use as a variable?: "
read QST
echo -e "$GR $QST"