What color is 00001?

The code 00001 is not a standard 6-digit hex color code, so it is ambiguous and could be interpreted in several ways, but if you are referring to hex colors, it is likely a shorthand or incomplete version of #000001. In web colors, hex codes are normally 6 digits, like #000000 for black and #FFFFFF for white. #000001 would be almost pure black with a tiny amount of blue, because the format is RRGGBB. 00 for red, 00 for green, and 01 for blue means 0 red, 0 green, and 1 out of 255 blue, which is so dark that the human eye would perceive it as black. If you add the hash and pad it to #000001, it is essentially black with an imperceptible blue tint. If you interpret 00001 as a 5-digit code, some systems might pad it to #000010 or #000001, both of which are still extremely dark near-black colors. In some design systems, 00001 could also be a color index number in a palette, not a hex code. For example, in some paint systems, color number 1 is white. But in digital terms, any code with all zeros or nearly all zeros is black or very dark gray. So 00001 is best understood as almost black, visually indistinguishable from black #000000.