To create the dye for orientation week, a mixture is created consisting of isopropyl (rubbing) alcohol, water, and gentian violet stirred in a large drum. The alcohol acts as a useful solvent to ensure that the dye will dry more quickly, as well as maintaining the solution’s sterility. The amount of water in the dye determines its strength, and therefore how easy or hard it is to remove it. The less water added to the mixture, the longer it will stay on the skin. The dye used for F!rosh Week is usually composed of one gram of dye per 600 litres of water. At this strength, it tends to come off in a day or two with vigorous scrubbing. However, the nails and hair will remain purple longest, as those cells are very slowly replaced.<ref>Michael Au, "The Science Behind Purple Dye", ''The Cannon''. http://cannon.skule.ca/the-science-behind-purple-dye-3/</ref>.
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