Markup Code (Pre-Tagged) ASCII

Hopefully Jim Hart is paying attention to this request.  I have created a data base application that creates a pre-tagged Ventura Text File creating flowing text with tables.  Client has requested that a Specific Cell have the type in WHITE with a 50% Black background..  I know and have used for years the code <$!B18> for White Letter on Black Background.   Code needs to be format for CMYK,  I have tried <C2,2,0,0,0,0,50> but this is forground (TEXT) .

I must be over tired.  I think this is my solution.  Try it yourself.  Still looking for some type of documentation on Available Codes and Usage

@MAJOR = TEST Major Head
@Head = Trail Run
@Z_TBL_BEG = COLUMNS(4), DIMENSION(PI), BOX(Z_Single), VGRID(Z_Single)
@Z_TBL_HEAD = TABLE HEAD VR, TABLE HEAD VR, TABLE HEAD VR, TABLE HEAD VR
<$!C2,5,2,0,0,0,100>Column1, <$!C2,5,2,0,0,0,100>Column2, <$!C2,5,2,0,0,0,100>Column3, <$!C2,5,2,0,0,0,100>Column4
@Z_TBL_BODY = TABLE TEXT, TABLE TEXT, TABLE TEXT, TABLE TEXT
<$!C2,5,2,0,0,0,50><C2,5,2,0,0,0,0>TEXT, TEXT, TEXT, TEXT
TEXT, TEXT, TEXT, TEXT
TEXT, TEXT, TEXT, TEXT
TEXT, TEXT, TEXT, TEXT
TEXT, TEXT, TEXT, TEXT
TEXT, TEXT, TEXT, TEXT
@Z_TBL_END =