acidify with glacial acetic acid, shake a moment, and then make alkaline with ammonium hydrate.
"The Starvation Treatment of Diabetes"
Lewis Webb Hill Rena S. Eckman
A better method of utilising the bleaching action of sulphur in a liquid form is to prepare a bath of bisulphite of soda, and acidify it with hydrochloric acid, then to enter the wool, stirring well for some time, and allowing it to steep for some hours, next to expose to the air for a while, and rinse as before.
"The Dyeing of Woollen Fabrics"
Franklin Beech
Along with saki our host also manufactured vinegar, which was made from rice and saki residues, which with the addition of some other vegetable substances were allowed to stand and acidify in large jars ranged in rows in the yard.
"The Voyage of the Vega round Asia and Europe, Volume I and Volume II"
A.E. Nordenskieold