Since this are 6 digits, I guess its simply a hex number so 0x0e0300 = RGB(0x0e,0x03,0x00) = 918272 = RGB(14,3,0). But thats just a guess, I would recommend that you simply try it yourself. Of cause this would work perfectly together with SPRITE2MEM: 9474192 = 0x909090 = RGB(0x90,0x90,0x90) = RGB(144,144,144).