Blue cheese is a general classification of cheeses that have had cultures of the mold Penicillium added so that the final product is spotted or veined throughout with blue, blue-grey, blue-green, or blue-brown mold and carries a distinct smell, either from that or various specially cultivated bacteria.
Vinegar, sour liquid that is made by the fermentation of any of numerous dilute alcoholic liquids into a liquid containing acetic acid. Vinegar may be produced from a variety of materials: apples or grapes (wine or cider vinegar); malted barley or oats (malt vinegar); and industrial alcohol (distilled white vinegar).
Vinegar is used directly as a condiment, and in the pickling of vegetables and other foods. Table vinegar tends to be more diluted (4% to 8% acetic acid), while commercial food pickling employs solutions that are more concentrated.