What Colours Are Available To Use With a Custom Number Format EXCEL

In addition to the 8 named colors you can also use [ColorX], where X is a number between 1 and 56. The named colors are identical to [Color1] to [Color8].

A quick way to see all the colors provided is to run the following in the immediate window in VBA (preferably in an empty workbook):

for x = 1 to 56:cells(x,1) = "AAAA":cells(x,1).numberformat = "[COLOR"&x &"]@":Next x

According to this, There are only 8 colors, the list is:

[Black]

[Green]

[White]

[Blue]

[Magenta]

[Yellow]

[Cyan]

[Red]

It applies to Excel 2016, Excel 2013, Excel 2010 and Excel 2007