It is worth waving away this fog of dogma that dominates much discussion involving America to consider that, even in a world characterised by realpolitik with its shades of grey, there remain issues in black and white.

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Remember that while these sites are a drab limestone grey today, history was never in black and white, and in fact, most historians say the buildings were painted in brilliant reds, blues and whites.

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In younger ash there is a distinctive smooth silver grey bark and sooty black buds.

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You would think that filing your taxes would be very black and white, but where CPAs really provide value is in grey areas.

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He is now employing a vision test used by the US Air Force which checks the ability to discriminate between white, black and grey - the lack of which is another symptom often seen in chronic ciguatera.

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In the case of John XXIII, the smoke went from black to white to a sort of grey color and back to white again, Ridley recalled.

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