Redrobes has a couple of photos of the limestone in Chedder here. So I thought it might be a good idea to gather our resources so here are more photos of limestone for colour reference. These ones are from around here, this is around the end of dry season, but nearer to sunset so wrong time of day:
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Shows there is a wide variety of options available, perhaps it is so colour versatile because it is based on white. Pretty neat over all.