| http://www.w3.org/ns/prov#value | - A method of determining whether a fluid sample applied to a surface is a sample of a more readily flowable first fluid or a sample of a less readily flowable second fluid, the method comprising the steps of irradiating the surface at a first point, detecting the radiation from the first point, determining from the detected radiation when the sample has reached the first point, irradiating the surf
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