| CPC C12Q 1/54 (2013.01) [G01N 21/272 (2013.01); G01N 21/78 (2013.01); G01N 31/22 (2013.01); C12Q 1/32 (2013.01); G01N 21/01 (2013.01)] | 14 Claims |

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1. A reagent comprising:
a chromogenic indicator; and
an aromatic hydrocarbon selected from disodium 1,3-benzene disulfonate and trisodium naphthalene-1,3,6-trisulfonate.
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