Years ago I had my entire house painted the standard very pale grey (Egyptian Cotton). Love it. Each year I've bought a small pot and touched up little scuffs etc. I've noticed it's never been a perfect match but that's been hardly noticeable. Last week we had some major building work completed and I needed to paint a whole new wall. There were also multiple areas where the little touch ups were needed. I painted the wall. Was impressed with the match. Painted everything else. A week on and the colour has developed a very distinctive pink hue. This is on every area I painted throughout the house, so it's not about aspect. My oh is colour blind so hasnt noticed, but I'm so annoyed. I'm going to have to choose a new wall colour, rather than risk trusting Egyptian Cotton ever again, and do the whole of all the walls I've touched up, and I've made my peace with the idea of my house being ever so slightly two-toned. And I know I'm going to have to get tester pots and that annoys me. I'm trawling old mn grey paint threads fir colour ideas, considering polished pebble.