Brother QL-810W Ultra-Fast Label Printer with Wireless Networking - Manual (Page 118)

How to Use P-touch Editor
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7
2-Color Printing Configuration
7
The Label Printer is capable of 2-color printing.
Configuring using P-touch Editor
Standard mode
7
Note
The Black/Red Print density can be adjusted using the Printer Setting Tool.
a Select [ 2.4" Black/Red ].
b Change the text, fill, and line colors, as necessary.