Color test strip carrying pad for correction
AssigneeKyoto Daiichi Kagaku Co., Ltd.
InventorKenichi Doi
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Abstract
A color test strip for detecting predetermined substances which carries on a support at least one coloring pad and at least one pad for. The correction pad having a pH which is adjusted in relation to pH of the coloring pad. The color test strip can avoid false positive and false negative results.
Claims4
In a color test strip for detecting the presence of at least one predetermined substance which comprises a support having disposed thereon at least one coloring pad which provides a color indication upon contact with a predetermined substance, and at least one pad for correction which does not provide a color indication upon contact with said predetermined substance, the improvement comprising:
- said pad for correction being impregnated with an acid selected from the group consisting of tartaric acid, citric acid, oxalic acid, phthalic acid, sulfosalicylic acid, metaphosphoric acid and acidic polymers, and having a pH which is .+-.1.5 from the pH of said coloring pad.
Dependencies are inferred from the claim text.