Cash dairy prices were mixed Tuesday at the Chicago Mercantile Exchange. Dry whey was up $0.0025 to $0.6975. No sales were recorded. Forty-pound cheese blocks were up $0.03 to $1.66. Three sales were recorded ranging from $1.6350 to $1.6575. Cheese barrels were unchanged at $1.6275. No sales were recorded. Butter was up $0.0025 to $1.5750. Twelve sales were recorded ranging from $1.56 to $1.5650. Nonfat dry milk was down $0.02 to $1.43. Twenty-five sales were reported ranging from $1.42 to $1.4…