| 摘要 |
A chloride ion indicator comprises a sheet form base carrying a compound including silver ions that will react with colour change with chloride ions, and an excess of silver ions over that present in said compound, the said compound and the said excess having been obtained by reaction of materials that provide an excess of silver ions of at least 10.2% by weight (as Ag NO3) based on said compound. The excess may be up to 58.5%. The silver compound may be silver chromate or dichromate; the excess silver may be present as nitrate, acetate or chlorate. The sheet form base may be paper, woven or non-woven cellulosic sheets, or fabric. The indicator may be made by dipping the sheet form base into aqueous solutions of a silver salt and a chromate or dichromate sequentially in either order; or by incorporating a preformed silver compound plus excess silver ion composition into the beater stage of a paper making process. The indicators may be used to in testing ovulatory function as described in Specification 1,103,401. |
