The A8 CTB can print 5 colors. Be sure you have the most current CTB file on your workstation. If not the current CTB file can be found here:
...A8 Cloud Library\CAD -Autocad\CAD
Color 10 prints red
Color 30 prints orange
Color 40 prints yellow
Color 70 prints green
Color 250 prints blue (but looks black on screen)