Fuji Photo Film Company, Limited

Fusae Osada

Fuminori Arai

A dry type analysis element for detecting a specific constituent in a liquid is provided. The dry type analysis element comprises a light-transmissive support having thereon at least one water-penetrative layer, at least one of said water-penetrative layer(s) containing a composition capable of interacting with said specific constituent in said liquid, wherein said composition contains a leuco dye comprising at least one compound selected from the group consisting of compounds represented formula [I] and salts of these compounds ##STR1## wherein R.sup.1 represents a substituted or unsubstituted aryl group, R.sup.2 represents a substituted or unsubustituted alkyl group, and R.sup.3 represents a substituted or unsubstituted aryl group, and said leuco dye is dissolved in a hydrophobic solvent to form a solution that is contained in said water-penetrative layer as a dispersion in a hydrophilic medium.

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Kanagawa, Japan

Fusae Osada