YELLOW, BLUE,AND CARMINE IMPRESSIONS 
S U P E R I M PO S E D 
PLATE IV 
PRIMARY COLOURS 
Flat tint of yellow 
Flat tint of blue 
-Line tint of yellow 
(barisarruUiL routing} 
Line tint of blue 
(vertical 7 nibbruy) 
BINARY COLOURS 
Flat tint of yedov 
overlaid, by flat tin 
of blue 
Flat tint ofyelZow 
overlaid, by flat tint 
of carmine 
Line tint of yellow 
overlaid by line tint 
of blue 
Line tint of yellow 
overlaid try' line tint 
of carmine 
Flat tint oAVeCow. 
overlaidl by line tint 
of blue 
Line tint of yellow 
overlaid by flat tint 
of carmine 
Line tint of yellow 
overlaid, by flat tint 
of blue 
Flat tint of yellow 
overlaid, byline tint 
of carmine 
TERNARY COLOURS 
Y- B -c 
Fiat tint of yellow 
overlaid by flat tint 
of blue and by flat tint 
of carmine 
Flat tint of yellow 
ox ci -laid, by flat tint 
of blue arid by tine-tint, 
of carmine 
\ y* btc 
Y+ b^c 
line tint, of yellow 
overlaid, by line tint 
of blue ana, by Tine tint 
of carmine 
Flat tint of yellow 
overlaid by line tint 
of bine and by line tint 
of Carmine 
m 
Flat tint of carmine 
Line tint of carmine 
(diagonal rulirur) 
Y B 
Y + C 
a + c 
Flat tint of blue 
overlaid by flat tint 
of carmine 
y + b 
JLi 
y + c 
b + c 
Line tint of blue 
overlaid ly line tint 
of carmine 
Y* b 
_v + C 
6 + c 
Flat tint of blue 
overlaid by Tine tint 
of carmine 
Y + c 
b * C 
Line tint of blue 
overlaid, by flat tint ,. 
of carmine 
f'Y + b*C 
Flat tint ofyelloyv 
averlaidby line tint 
of blue and by flat tint 
of carmine 
*B*C 
tine tint of yellow 
Overlaid by flat tint 
of blue and by flat tint 
of carmine 
y.R* 
b + C 
yryell 
overlaid by flat tint, 
of blue and by line tint 
of carmine 
Line tint of yellow 
overlaid by tine tint 
of blue and by flat tint 
of eamnccne 
Geological Survey. Canec/a. 
Chart illustrating a process of lithographic three- colour printing 
for the reproduction of geological maps. 
To accompany Bulletin by C. 0. Seneca l 
