Vino de Milo Sundried Tomato with Merlot Dressing http://qualifirst.com/product/Toront/107284/Sundried-Tomato-w-Merlot-Dressing-355ml-Vino-de-Milo Blair’s Co… Question by judywhitebook: Is there a chemical reaction between granite and tomatoes? I buy “grape” tomatoes in plastic containers with air holes. If I keep the container on a granite counter, I later find a sticky, brownish-red substance on the counter. The tomatoes do not touch the counter and appear unaffected. Best answer: Answer by aussie_east_enderThe moisture causes the iron in the granite to rust. Add your own answer in the comments!