Brother GTX-4 - For Other Applications: Use Background Black Color

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Creating print data
5-5-4. For other applications: Use background black color
If you have selected [Color+White Ink] in the [Select Ink:], the setup items of [Use background black color:] will appear.
In the event that you wish to print a black T-shirt making use of the T-shirt's background black color, mark the [Use
background black color:] checkbox.