Sentence:  <WSD>Isinglass</WSD> is brought to market in different forms, sometimes in that of simple plates, at other times rolled up in different shapes, or cut into fine thread. When of good quality <WSD>isinglass</WSD> is of a whitish colour, thin, and semi-transparent, but tough and flexible, destitute of taste as well as of smell. The inferior kinds are thicker, yellowish-coloured, opaque, and sometimes have a fishy smell and taste. In boiling water <WSD>isinglass</WSD> is entirely dissolved, with the exception of a very minute portion of impurities. 
Meaning of the word marked with <WSD> tags:  A form of gelatine obtained from the air bladder of the sturgeon and certain other fish, used as an adhesive and as a clarifying agent for wine and beer.