Custom Printed Magazine.

Three things, and the first matters most.

Specify brand colours as Pantone, not as CMYK builds. A CMYK build is four inks approximating a colour, and that approximation shifts with press conditions, paper and ink batch. A Pantone is a mixed ink matched to a physical standard. Over several issues, CMYK brand colours visibly drift; Pantones hold.

Maintain a colour profile for the publication and use it consistently rather than re-deriving settings each issue.

Print on the same press where possible. Different presses have different characteristics, and staying on one removes a variable entirely.

The reason this matters is subtle but real. Readers rarely consciously notice that issue three's brand red differs from issue two's — but the publication starts to feel slightly amateur without them being able to say why. Consistency is one of the things that makes a magazine feel like an established title rather than a series of separate documents.