<unk>  (American English) or<unk> e (British English) is a way of expressing concentration.<unk>  testing employs serial dilution to obtain approximate quantitative information from an analytical procedure that inherently only evaluates as positive or negative. The<unk> e corresponds to the highest dilution factor that still yields a positive reading. For example, positive readings in the first 8 serial, twofold dilutions translate into a<unk>  of 1:256 (i.e., 2−8).<unk> es are sometimes expressed by the denominator only, for example 1:256 is written 256. The term also has two other, conflicting meanings. In<unk> ation, the<unk>  is the ratio of actual to nominal concentration of a<unk> ant, e.g. a<unk>  of 0.5 would require 1/0.5 = 2 times more<unk> ant than nominal. This is to compensate for possible degradation of the<unk> ant solution. Second, in textile engineering,<unk> e is also a synonym for linear density.
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