| 摘要 |
<p>An indicating desiccant comprises a silica-based material having impregnated thereon a source of iron and a source of bromide, the source of iron being present in an amount up to 2.0 percent by weight, calculated as Fe with respect to weight of the silica-based material, and the source of bromide being present in an amount such that the weight ratio of Br to Fe is at least 0.1:1.</p> |
