Sinclair QL Beginner's Manual page 78

180 END FOR colour
If you wish to try different stipples you can add a third code number to the colour specification. For
example:
INK 2,4,1
would specify a red and green horizontal stripe effect. A block of four pixels would be:
COLOUR PARAMETERS
You can specify a colour/stipple effect as described above by using three numbers. For example:
INK colour, contrast, stipple
could be used with :
colour in range 0 to 7
contrast in range 0 to 7
stipple in range 0 to 3
You could achieve the same effect with a single number if you wish though it is not so
easy to construct. See the Concept Reference Guide - colour.
The following program will display all the possible colour effects:
100 REMark Colour Effects
110 FOR num = 0 TO 255
120 BLOCK 100,50,40,50,num
130 PAUSE 50
140 END FOR num