Q:

What's this numeric notation called?

add(new CustomLabelField
("Please enter your credentials:", Color.WHITE, 0x999966, 0));

What is that 0x999966?
I want to place this color there so how can I convert it? I just need an online tool that will convert it for me but I don't even know what it's called! :D
link for more info
Thanks!
Edit: OK, so this is called a hexadecimal number, but I still don't know how to convert something like "#716eb3" to the notation accepted by the CustomLabelField constructor. Any help?

A:

Hexadecimal, as in, base 16.  If 0x999966 is indicating a color, then it's usually encoded such that each two hex digits encode a color (as RGB), so it's 0xRRGGBB.

