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Due to the effects of bacteria when it is curing.

Failure to remove CO2 bubbles during production, due to inconsistent pressing, results in the large holes ("eyes") characteristic of this cheese. Historically, the holes were a sign of imperfection, and until modern times, cheese makers would try to avoid them.

It has a piquant, but not very sharp, taste.

Three types of bacteria are used in the production of Emmentaler: Streptococcus thermophilus, Lactobacillus, and Propionibacterium freudenreichii. In the late stage of cheese production, P. freudenreichii consumes the lactic acid excreted by the other bacteria, and releases carbon dioxide gas, which slowly forms the bubbles that make holes.

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