butter muslin

Noun

 * 1) A cotton fabric similar to cheesecloth but with a tighter weave, used for draining and wrapping butter and cheeses.
 * 2) * 1916, Dairy Produce, Volume 23, Issue 1, Chicago Produce Company,
 * Always strain the cream into the churn through a fine piece of butter muslin, and never fill it more than one-third full; otherwise there will not be sufficient agitation when the cream is churned.