GMG OpenColor and GMG SpotColor Editor use the manufacturer's official target values for spot color calculation. If a spot color has been verified on GMG Spot Color Control Strip 2.0 with low dE values, you can thus rely on it being reproduced correctly, even if the result may differ visually from your color guide.
Printed Pantone® color guides, like all printed products, are subjects to production fluctuations and age-related color changes. They are thus not a reliable reference for comparison.
This is how we make sure that your spot colors are spot on: