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There are many types (formulas/components) of Plaster. "Normal" plaster, if there is such a thing is usually White. Plaster is easily colored by using color additives when it is mixed.
It makes very little difference
It makes very little difference
The finish plaster is normally white all the way through. It sounds like you are dealing with a pool that has been replastered by the method of putting a "brown coat"/"scratch coat" (the gray plaster you noted) over the original finish plaster surface, and a new finish coat of white plaster on top of that. The scratch coat more like a thin concrete than plaster (doesn't have the white marble dust in it) and is used to get a better bond to the old surface.
When the penguin is hunting a fish and is swimming above it, the fish doesn't notice anything. When it is hunting from below the fish doesn't notice anything. This is caled countershading and it is a form of camoflouge.
The best color would be your choice of a new plaster finish. Why would you want to paint a pool???
No, the plaster can be patched. But how good the patch looks depends on several things like the color of the plaster, its age, and the person doing the patching. New, white plaster would be the easiest to patch while old, colored plaster would be more difficult to do satisfactorily.
black colour is better in white activa .
The shortfin mako is grey blue on top, with a white belly.
No, plaster of Paris and white cement are not the same. Plaster of Paris is a porous material that will disintegrate outside in the rain. White cement is more durable and should last outside in the rain.
well it doesn't really have a big impact. but i would go with the color blue because it's a florescent color and if you have googles inside the pool and you see the blue it looks beautiful!!
Just paint it white!!