I just did a bit of research and it seems they do it with a printer! The company says the colour extracts are odourless and flavourless, the brown ones are made either from coffee or malt extract which would be a similar flavour profile than Guinness, and (a bit of educated guessing from the top of my head) I would put the quantity of ‘ink’ in these prints in the tens of micrograms, like 0.01-0.1 mg. I think the flavour and aroma wouldn’t be affected.
Never mind that. WTF have they decorated it with. You’re not supposed to add shit to Guinness.
These spray food safe dyes, wouldn’t affect t the flavor unless you’re overly sensitive.
I only ask because it’s the same colour as espresso crema, which would definitely affect the flavour.
I just did a bit of research and it seems they do it with a printer! The company says the colour extracts are odourless and flavourless, the brown ones are made either from coffee or malt extract which would be a similar flavour profile than Guinness, and (a bit of educated guessing from the top of my head) I would put the quantity of ‘ink’ in these prints in the tens of micrograms, like 0.01-0.1 mg. I think the flavour and aroma wouldn’t be affected.