2 spot colour gradient issue with overprint

[Adam Morley]

Hello, I'm experiencing an issue in illustrator 24 & 25 ( Mac ) 

An object with a gradient with 2 different spot colours won't overprint. Attributes are of course set to overprint, overprint preview shows no overprint occuring and a test pdf shows no overprint when checking the file separations in acrobat.

it's also worth noting, if I do a gradient with 1 spot colour to a process colour overprint works normally. Is there an issue with 2 different spot colours in 1 gradient set to overprint?

Any help or advice on this would be greatfully appreciated.

Adam 

[Kurt Gold]

Can you share a sample Illustrator file?

[Adam Morley]

Hi Kurt,

Please see attached test file.

This issue also appears to happen in Indesign.

Thanks

Adam

[Kurt Gold · Accepted solution]

Thanks for the sample file.

The heart would overprint if the rectangle in the background had not the same spot colour applied as one of the spot colours in the gradient (Pantone 811 C). The overprinting mechanisms don't allow what you are trying to do.

As an alternative you may set the heart to multiply in the Transparency palette.

[Adam Morley]

Thanks Kurt! Cant believe I didn't twig that. Cheers