This depends on what program you have created your artwork with.
We suggest that you create all of your adverts in Adobe InDesign, and upon exporting use a Newsprint ICC profile, which should make your artwork in the correct colourspace. Adsend suggests ISONewspaper26v4 for Newsprint, for magazines, we suggest adhering to the industry 3DAP (Digital Data Delivery for Australian Publications) standard.
There are alternate methods to resolve your ink weight issue. If you require any further assistance, please contact Adsend Client Services.