question: Why do some foods (looking at you, spaghetti) permanently stain Tupperware while others seemingly don’t?
comment: Spaghetti, or any tomato sauce has a compound called Lycopene in it, which is a red pigment related to beta-carotene. It is insoluble in water and tends to get stuck in porous things. Since plastic is porous at the microscopic level, Lycopene gets stuck inside and makes it difficult to remove.
passages: Section::::Product lines.
  
  Tupperware's product ranges are often marketed under different names in different markets, and the product ranges and colors themselves differ between markets. Tupperware's lines include:
  
  BULLET::::- "Eleganzia" (UK, DE), "Illusions" (AU): a "glasslike" range of serving dishes
  
  BULLET::::- "Wonderlier" (US, Canada, UK), "Bowl Maravilloso" (URU): round storage bowl sets in bright colours
  
  BULLET::::- "FlatOut!" (US), "MiniMax" (UK), "Go Flex" (AU), "Compactware" (URU): bowls that flatten for storage, and can be expanded when needed
   In many countries, Tupperware products come with a lifetime guarantee. The company is best known for its plastic bowls and storage containers. However, in recent years it has branched out into stainless steel cookware, cutlery, chef's knives, and other kitchen gadgets. After experiencing a slump in sales and public image in the mid-1990s, the company created several new product lines to attract a younger market.
  
  In some countries including Belgium, Australia, Ireland and the U.S., Tupperware markets their parties and career opportunities through mall kiosks from time to time.
   Section::::Structure and physical properties.:Staining and removal.
  
  Lycopene is the pigment in tomato-containing sauces, turning plastic cookware orange, and is insoluble in water. It can be dissolved only in organic solvents and oils. Because of its nonpolarity, lycopene in food preparations will stain any sufficiently porous material, including most plastics. To remove this staining, the plastics can be soaked in a solution containing a small amount of household bleach.
  
  The bleach does not actually dissolve the non-polar lycopene; it oxidizes, and the oxidized polar metabolite is dissolved.
  
  Section::::Diet.
  
  Section::::Diet.:Consumption by humans.
   As said, a pottery sometimes has a different actual use than intended use. This is the reason why when archaeologists study the function of a pottery, they tend to focus on how the tool was actually used. They do this by studying the alterations that the pottery has. These alterations, accretion and attrition, are commonly the abrasions and scratches on the vessel. In Skibo's study of Kalinga potteries functions, he relied on three main tests, namely (1) dissolved residue, (2) surface attrition and (3) carbon deposition. 
   Tupperware Brands Corporation was founded as The Tupperware Company in 1946 in South Grafton, Massachusetts by Earl Tupper. In 1958, Tupper sold The Tupperware Company for $16 million to Rexall and the company's headquarters were moved to Kissimmee, Florida. In December 2005, Tupperware Corporation changed its name to Tupperware Brands Corporation to reflect the company's increasing product diversity.
  
  Since 1997, Tupperware has been directed by Rick Goings.
  
  Section::::Brands.
   As said, a pottery sometimes has a different actual use than intended use. This is the reason why when archaeologists study the function of a pottery, they tend to focus on how the tool was actually used. They do this by studying the alterations that the pottery has. These alterations, accretion and attrition, are commonly the abrasions and scratches on the vessel. In Skibo's study of Kalinga potteries functions, he relied on three main tests, namely (1) dissolved residue, (2) surface attrition and (3) carbon deposition. 
   BULLET::::- Without delay, the "solvent front", the furthest extent of solvent up the plate, is marked.
  
  BULLET::::- The plate is visualized. As some plates are pre-coated with a phosphor such as zinc sulfide, allowing many compounds to be visualized by using ultraviolet light; dark spots appear where the compounds block the UV light from striking the plate. Alternatively, plates can be sprayed or immersed in chemicals after elution. Various visualising agents react with the spots to produce visible results.
  
  Section::::Technique.:Separation Process and Principle.
   Collectors and processors then hull the coffee in a semi-wet state, which gives the beans a distinctive bluish-green appearance. This process reduces acidity and increases body, resulting in the classic Indonesian cup profile.
  
  Larger processing mills, estates and some farmers' cooperatives on Sumatra, Java, Sulawesi and Bali produce "fully washed" coffee.
   In recent years, Tupperware in North America has moved to a new business model which includes more emphasis on direct marketing channels and eliminated its dependency on authorized distributorships. This transition included selling through Target stores in the U.S., and Superstores in Canada, with disappointing results. Tupperware states this hurt direct sales. In countries with a strong focus on marketing through parties (such as Germany, Australia, and New Zealand), Tupperware's market share and profitability continue to decline.
   Craquelure is frequently induced by using zinc white paints as the underlayer in pentimento techniques. Zinc whites with small zinc oxide particles (~250 nm) are more successful at inducing craquelure than larger particles because it does not adhere to the sublayer. Additionally, zinc white paints using linoleic acid-based binders are more successful at producing craquelure than paints with other binders.
  
  Section::::Craquelure in ceramics.
   Despite DuPont's asserting that "cookware coated with DuPont Teflon non-stick coatings does not contain PFOA", residual PFOA was also detected in finished PTFE products including PTFE cookware (4–75 parts per billion). However, PFOA levels ranged from undetectable (<1.5) to 4.3 parts per billion in a more recent study. Also, non-stick cookware is heated—which should volatilize PFOA; PTFE products that are not heated, such as PTFE sealant tape, had higher (1800 parts per billion) levels detected. Overall, PTFE cookware is considered an insignificant exposure pathway to PFOA.
  
  Section::::Global occurrence and sources.:Sources to people.:Potential path: sludge to food.
   Section::::Company history.
  
  Tupperware was developed in 1946 by Earl Silas Tupper (1907–83) in Leominster, Massachusetts. He developed plastic containers used in households to contain food and keep it airtight, which featured a then-patented "burping seal". Tupper had already invented the plastic for Tupperware in 1938, but the product only worked with the emergence of the "sale through presentation" idea, held in a party setting.
   BULLET::::2. Surface Attrition – Skibo's study on the attrition of the pots showed how the pot was used. By looking at the trace attritions inside the vessel, the type, frequency, angle and direction of stirring for each pot was determined. Furthermore, Skibo also concluded that two pots can be differentiated from each other, on the basis of what type of food it cooks, from the abrasions. He said that rice pots will have a little amount of stirring while the vegetable/meat pots will have numerous marks.
   In order to aid browning, sometimes an accessory browning tray is used, usually composed of glass or porcelain. It makes food crisp by oxidizing the top layer until it turns brown. Ordinary plastic cookware is unsuitable for this purpose because it could melt.
   Lincrusta is made from a paste of gelled linseed oil and wood flour spread onto a paper base. It is then rolled between steel rollers, one of which has a pattern embossed upon it. The linseed gel continues to dry for many years, so the surface gets harder over time.
  
  Both oil-based and water-based paints can be applied to Lincrusta, therefore it can provide a base for effects from simple colour washes or marbling, scumbling, and glazing, to more elaborate gilding and ver de mer treatments.
  
  Section::::History.
   BULLET::::- A solution of dishwashing liquid and water may be used to remove coffee, tea, olive oil, soda and fruit juice stains from fabrics. One dishwashing liquid brand has been used to remove stains from white or lightly-colored cloth napkins.
   Section::::Procedure.
  
  Trichrome staining techniques employ two or more acid dyes. Normally acid dyes would stain the same basic proteins, but by applying them sequentially the staining pattern can be manipulated. A polyacid (such as phosphomolybdic acid or tungstophosphoric acid) is used to remove dye selectively. Polyacids are thought to behave as dyes with a high molecular weight: they displace easily removed dye from collagen.
   Some popular Capiz shell chips decorating design include gift items, indoor decoration and outdoor decoration ornaments. Capiz chip-made products range from lanterns, lamp shades, window pane, chandeliers, curtains, picture panels and frames, Capiz shell balls, plates, decorative bowls, candle holders, tiles, flower vase, door hanging chime, soapdish, pendant, globelight, necklace decor, beads, bird cage, floor lamp holders, faux chandelier, gift boxes, collection item rack and many more.
  
  "Bulad" or dried fish is a major product. There are several varieties of dried fishes that can be found in Capiz.
  
  Section::::Economy.:Business Process Outsourcing.
   Sudan staining is the use of Sudan dyes to stain sudanophilic substances, usually lipids. Sudan III, Sudan IV, Oil Red O, Osmium tetroxide, and Sudan Black B are often used. Sudan staining is often used to determine the level of fecal fat to diagnose steatorrhea.
  
  Section::::Specific techniques.:Conklin's staining.
  
  Special technique designed for staining true endospores with the use of malachite green dye, once stained, they do not decolourize.
  
  Section::::Common biological stains.
   The use of unmarked plastics for microwave cooking raises the issue of plasticizers leaching into the food, or the plastics chemically reacting to microwave energy, with by-products leaching into the food, suggesting that even plastic containers marked "microwavable" may still leach plastic by-products into the food.
  
  The plasticizers which received the most attention are bisphenol A (BPA) and phthalates, although it is unclear whether other plastic components present a toxicity risk. Other issues include melting and flammability. An alleged issue of release of dioxins into food has been dismissed as an intentional red herring distraction from actual safety issues.
   Tupperware spread to Europe in 1960 when Mila Pond hosted a Tupperware party in Weybridge, England and subsequently around the world. At the time, a strict dress code was required for Tupperware ladies, with skirts and stockings (tights) worn at all times, and white gloves often accompanying the outfit. A technique called "carrot calling" helped promote the parties: representatives would travel door to door in a neighborhood and ask housewives to "run an experiment" in which carrots would be placed in a Tupperware container and compared with "anything that you would ordinarily leave them in"; it would often result in the scheduling of a Tupperware party.
   While PTFE is stable and nontoxic at lower temperatures, it begins to deteriorate after the temperature of cookware reaches about , and decomposes above . The degradation by-products can be lethal to birds, and can cause flu-like symptoms in humans—see polymer fume fever. Meat is usually fried between , and most oils start to smoke before a temperature of is reached, but there are at least two cooking oils (refined safflower oil at and avocado oil at ) that have a higher smoke point.
  
  Section::::Ecotoxicity.
   In Santa Fe de la Laguna, a number of potters make glazed ware in popular shapes with black or green glaze covering most of the piece and the rest in average quality transparent glaze. Black glazed is generally used on large pieces such as water or fruit punch bowls with lids and decorated with raised leaves or roses. Many of these are made by Matias Jerónimo. Carmen Gaspar makes tableware with designs of animals or fish in white slip under green glaze. There has also been experimentation with new glaze colors, such as blue and mauve.
   The tradition of Tupperware's "Jubilee" style events continues to this day, with rallies being held in major cities to recognize and reward top-selling and top-recruiting individuals, teams, and organizations.
   These japanned metal objects are very stable so a great many still survive. Many pieces survive today with little rust. In most cases it is easy to ascertain the underlying metal because it can be seen in losses or scratches. If the japanning is intact, a magnet can be used to identify iron. Most iron trays show some rust on the back where only a single coating was applied. Even the tin plated iron objects show rust in some areas.
  