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Color on the Web
How We See Color
Light and Color
The Code
Base 16 or
The Hexidecimal Number System

Exercises in Base 16
Dark and Light Values
Color Quiz
Experiment with Color

BASE 16 or THE HEXADECIMAL CODE

First, let's look at the number system we are most familiar with. Maybe you didn’t know it, but our number system is a "base 10" system. That just means that we group things together in tens. Take the number 10 for example:
10 stands for 1 group of ten and nothing left over; we say "one ten and no ones".
23 stands for 2 groups of ten and three left over; we say "two tens and three ones".

Our numbers look like this:
0,1,2,3,4,5,6,7,8,9 and then, since we have one whole group of “ten”: we write:10—one group of tens and no ones.

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