How i got exact colour matches

To make sure i got exact colour matches, on the colour changer for each colour there are a certain amount of letters with specific numbers. When i found the perfect purple i wanted for my text boxes on my contents, i wrote down each number for each letter so that for each seperate text box all i needed to do was to enter the numbers so i got the exact same colour. Before i chose the purple for definate, i done this with the blue aswell, incase i chose the blue and needed it for all three text boxes.