Pineapple ripened or off-green. A plant growth regulator, Ethephon, is typically sprayed onto the fruit one week before harvest, developing ethylene, which turns the fruit golden yellow. After cleaning and slicing, a pineapple is typically canned in sugar syrup with added preservative. A pineapple never becomes any riper than it was when harvested. The fruit itself is quite perishable and if it is stored at room temperature, it should be used within two days; however, if it is refrigerated, the time span extends to 5–7 days. Mimi Sheller writes: "The pineapple entered European iconography as a symbol of welcome and hospitality,
Hospitality service Pasporta Servo and published its first membership directory, which listed 40 hosts. In 1971, Sue Coppard founded WWOOF ("Worldwide Opportunities on Organic Farms"), a network in which food, lodging, and education is provided to guests in exchange for housekeeping and farmworker services. In 1977, Presbyterian minister Wayne Smith and U.S. President Jimmy Carter established Friendship Force International, with the mission of improving intercultural relations, cultural diplomacy, friendship, and intercultural competence via organized trips involving homestays. In 1992, Hospex.org became the first internet-only hospitality service; it later was folded into Hospitality Club, created in 2000 by Veit Kühne. In 2004, Casey