What contrast is enough on screen?
On the digital menu and in the Story, text and background have to separate enough to be read in sun on the phone, close to the contrast a reading standard asks for. You do not need a report: you need to open the PDF in the street.
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Test the grey of the price on the photo on the phone, at midday. The miss is a white price on a pale plate and nobody sees the number. Cristina leaves the type off the light part of the photo, or on a base, and checks it on a phone in the sun.