A color mixed, in this case mathematically averaged, with its complement produces a neutral gray.
RGB is in six digit format.
RGB defines color using three light primaries; R for red, G for green and B for blue.
Each primary is given a double digit hexadecimal (0-9,A-F) value; (F=15 decimal and
FF=255 decimal). Each color is defined by combining the three primary values in RGB order.|
For instance: red=FF0000, yellow=FFFF00, blue=0000FF, gray=808080 or A7A7A7, black=000000 and white=FFFFFF.