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,
International Symbol of Access equally thick lines, which may give an impression of a monogram of letters. With a 'head' on the symbol this inconvenience would disappear." Taking the original copy of the design, Montan would add a circle to the top of the seat to give the impression of a seated figure. The symbol is often seen where access has been improved, particularly for wheelchair users, but also for other disability issues. Frequently, the symbol denotes the removal of environmental barriers, such as steps, which also helps older people, parents with baby carriages, and travellers. Universal design aims to obviate such symbols by