This VDU is used to set the tint for a colour in a 256-colour mode:
VDU 23,17,0,tint,0,0,0,0,0,0,0 Text foreground
VDU 23,17,1,tint,0,0,0,0,0,0,0 Text background
VDU 23,17,2,tint,0,0,0,0,0,0,0 Graphics foreground
VDU 23,17,3,tint,0,0,0,0,0,0,0 Graphics background
Tint is &00,&40,&80 or &C0 (uses only 2 top bits).
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