The notion of painting roofs white to increase albedo is an old one (look up "Whitecap", which I was familiar with about 30 years ago). And the practical limit is of behaviour in the environment: dirt, grime, damage (hail, wind, birds, insects, ultraviolet light, etc.). It's unlikely that a "whitest white" substance will also be optimised for those characteristics.
But a durable, easily-cleaned, reflective surfacing material could prove useful.
It's all but certain that the actual applications for this material won't be as roofing. At least not for standard construction.
The notion of painting roofs white to increase albedo is an old one (look up "Whitecap", which I was familiar with about 30 years ago). And the practical limit is of behaviour in the environment: dirt, grime, damage (hail, wind, birds, insects, ultraviolet light, etc.). It's unlikely that a "whitest white" substance will also be optimised for those characteristics.
But a durable, easily-cleaned, reflective surfacing material could prove useful.
It's all but certain that the actual applications for this material won't be as roofing. At least not for standard construction.