[Sca-cooks] Spirits of hartshorn

[ranvaig at columbus.rr.com]

More on Hartshorn,

from A Miscellany by Cariadoc and Elizabeth
http://www.daviddfriedman.com/Medieval/miscellany_pdf/Miscellany.htm

Hartshorn (Ammonium Carbonate) was used for stiffening jellies by 
about the end of the sixteenth century (Wilson) but we have found no 
reference to its use as a leavening agent prior to the late 18th 
century.