| http://www.w3.org/ns/prov#value | - According to the present invention, the above objects are accomplished by providing a test paper comprising a filter paper bearing a mixed berberine sulfate/pigment solution applied on a part thereof, the mixed solution being produced by dissolving berberine sulfate and a pigment in water or an organic solvent such as alcohols including methanol and acetone, so that the concentration of salts cont
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