https://www.unilad.co.uk/food/brewery-invents-reverse-guinness/amp/ Picture as a teaser, rather than quoting the article. Some of the other pictures look... less off-putting? Quite curious how this was accomplished. Let's hear your theories, industry pros and homebrewers. I've long wondered what determines the precise color of a beer's head, given that some are quite divergent from the liquid's color, and beers with the same base SRM can have wildly different head color. These folks seem to have cracked the code and then abused the hell out of it.