Can spot colours be mixed in Illustrator 8.0

[Balwant]

Can anybody tell me? How to mix spot colours (two or more) in Adobe Illustrator 8.0.

For example I want only two colour output for printing.

Let there be a simple rectangle. I want to fill it with 10% of some spot colour and 40% of some other spot colour. Can it be done in Illustrator.

I know for printing purpose I can use simple process colours e.g. 10% cyan and 40% magenta.
Only thing is that I want to see the mixing result on my screen also (without proofing the actual colour on paper) i.e. WYSIWYG
Is it Possible. Please help?

 

[askIllustrator]

its called overprinting. Look in your Attributes Pallette for two checkboxes marked Overprint fill and overprint stroke. Fill your first box with 10% of the desired spot color, copy it and paste in front then fill it with 40% of the other color. Then in the attributes pallette check overprint fill for the top object only.

 

[Balwant]

Well! I think I should make it more clearer.

Actually, I want to fill the same object (say rectangle) with two different spot colours. And I want to see the mixing result on my Computer's Screen. (To save the colour proofing cost.)

I don't want to overprint any plate.I want to use two spot colours to be printed at different angles. So that I get a third colour. And I want to see how this third colour will look on my Computer's Screen. (Without actually printing on proofing it). To save some money, of course.

I know that in gradients you can use two or more spot colours, but then that is different thing.

 

[askIllustrator]

Im afraid there is know other way to fill one object with more than one color. Illustrator 9 will let you see the combination in the Overprint Preview if you build it with the meathod in my last post. I wish adobe would let you use more than one spot color in a multiple slider fashion like CMYK works. We'll just have to cross our fingers.