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The overprinting options in the Attributes palette are greyed out.
Yes Transparency palette > multiply
I stopped using overprint attribute after new millennium, as you have to turn on overprint preview to see,. With multiply much easier to proof and ensure your work separates correctly.
I've just had a short circuit in my head, all these years I thought Multiply was just a visual effect, not an actual overprinting. I tried it and can confirm, it's actually overprinting.
I feel old now 😉