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We have a 700mm nook in our kitchen which we are making into a hot drinks station. The cupboards above and below the worktop will house mugs, boxes of tea and coffee beans, and on the worktop itself about half of it will be occupied by a coffee machine and the other half of it will be occupied by a small round 300mm diameter undermount sink and a boiling water tap. I would have ideally preferred a 200mm sink so as to give more space to the coffee machine, but we haven't been able to find one that works with our colour scheme, so 300mm it is. I came across this article which discusses the pros and cons of different reveal styles and it made me think I could have a negative reveal so that I lose less than a 300mm diameter from my worktop. The only disadvantage quoted in the article of a negative reveal is said to be "The countertop ledge can easily chip, and its exposed underside may attract mold. Though these risks depend on your countertop material, a durable stone countertop might cancel out those concerns." We are fitting 30mm thick caesarstone so I'm assuming this counts as "durable stone" and that chips are not a risk factor. Given the only thing splashing down that sink will be hot water, tea, coffee and the odd bit of unused milk, should I be worried about mould? Could I have a 25mm negative reveal all the way around so that my sink hole ends up being just 250mm in diameter or is this asking for trouble in terms of mould? We are having MVHR in case that makes any difference.