BLUE IMPRESSION 
PLATE II 
PRIMARY COLOURS 
Flat tint of ycttaw 
Flat tint of blue 
Flat tint of car-mine 
Fine tint of yellow 
(faariscarvtaliriding ) 
Fine tint of bine 
fvertioaZ exitenff) 
BINARY COLOURS 
□ 
Fine tint of car-mine 
(dLagofnal ruling) 
Y + B 
Y + C 
B + C 
Flat tint of yetZow 
over-Ladd, by tint tint 
of blue 
Flat tint of yellow 
overlaid by flat tint 
of camrune 
Flat tint of bine 
overlaid^ by flat tint 
of carmine 
y* b 
y 
b + c 
Fine tint of yellow 
overlaid by line, tint 
of blue 
auto rjw- or vctcow 
overlaid by bine tint 
of carmine 
y + c 
Fine tint, of blue 
overlaid, by line tint 
of carmine 
Flat tint of yellow , 
overlaid by line tint- 
of blue 
Fine tint of -yellow 
over-laid by flat tint 
of carmine 
Flat tint of blue 
overlaid by line tint 
of carmine 
y + B 
Y + c 
b + C 
Fine tint af yellow 
overlaid by flat tint 
of blue 
Flat tint of yellow 
overlaid try lint tint 
of oarrnine 
TERNARY COLOURS 
Line tint, of blue 
overlaid by flat tint 
of oannine 
> *B - 
overlaid by flat tint 
of blue and. Iv flat tint 
of carmine 
Flat tint af yellow 
overlaid by flat tux. 
of blue and 
of can 
id by lb 
rrrahe 
line tint. 
Flat tint of yellow 
crverlaid by tine tint 
of Line and by flat tint 
of carmine 
y* b+c 
Y+ b+c 
>+B+C 
Fine tint of yellow 
overlaid by Line tint 
of blue and try Tine tint 
of carmine 
Flat tint of yellow 
overlaid, by Line tint 
of bLue and byline tint 
of carmine 
Fine tint af yellow 
overlaid by flat trap 
of blue and by flat tint 
of carmine 
y* B* 
y * b + C 
jfyelt 
overlaid Try flat tint 
of blue and by line tint 
of carmine 
Fine tint of yellow 
overlaid by one tint 
of blue and by flat bint 
of carmine 
Geological Survey Canada. 
Char- L illustrating a proce ss of litlio graphic three-colour printing 
for the reproduction of* geological maps. 
) accompany Bulletin by C O. Seneca! 
