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Felton Street Sydney
16 Sept 1853

Wm Macarthur

Dear Sir
The best way to cut down Isinglass for fining wine is - take as much of fine Isinglass, as you will want for some time to come - Sprinkle it well all over with acetic acid - let it lay all night - next morning cover the Isinglass with old wine if slightly acid so much the better - & if only so much old wine is used as will just cover the Isinglass it will form a thick Jelly - perfectly soluble in good wine, and when wanted for use it is only needed to whisk up as much as you think the condition


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