colour channels

channels palette- a way to work with spot colour

overprinting

when 1 channel overlaps another- good to create a 3rd colour- simulates multiply layer style

 

solidatary
black is usually the last ink to be printed


tint creates a shade of colour. eg lighter pink here

save as a photoshop format or TIFF file so that you can save the spot colours 

in illustrator the reference number travels with the tiff or photshop file so that its is accurately reproducable

SEPARATIONS

150lines per inch typical printing

moire patterns happen if dots aren't rotated properly by the printer

screenprinting no more than 65 LPI. 20 for visible dots. 50 is good average
angles for screenprint 15for first ink, 75 for magenta, 105 yellow, 155 black.

if there are no tints dont change the frequency or the angle.