Olives and olives differenceWhile we remembered thatblack ones are olives and green ones are black olives, manufacturers have come up with another way to confuse us. It turns out that not all olives are naturally black. Sometimes artificially dyed black olives are passed off as olives. Therefore, to avoid disappointment, read the labels on the packaging. Dyed "olives" must be labeled accordingly, reports the Information Service for Agriculture and Food in Stuttgart. Iron salts, iron gluconate or iron salt of lactic acid are used as dyes. However, additives based on lactic acid (E 579 and E 585) are not officially considered dyes.
