A hexadecimal colour code is a six-digit code where the code for any particular colour the RGB values, each represented by a 2-digit code as follows:
In each case, these codes include leading zeros, so that they are two digit codes in the range [00, FF]. This allows 256 different values for each colour type making 16,777,216 colours in all.
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hexadecimal
#1a0001 is a hexadecimal color, used commonly to make text or background on a webpage a certain color. It is a very deep red, almost black color. #000000 is the hexadecimal code for black, which would be more commonly used.
The color charts many see on the web are HTML codes which contain both numbers and letters. The simplest answer is that both the numbers and letters are used in the hexadecimal numeral system. For example, FF in hexadecimal equals 255.
AAAAAAAAAAAA is the Hexadecimal.
234 in hexadecimal is EA.