Practical investigations
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I am doing an investigation on analysis of acidity, alcohol content, sugar content and sulphur dioxide content in both red and white wine, but I need to know what chemicals make the red colour in red wine and by using which process I could identify it.
Igloo writes ..........
Red wines are made by allowing grape juice to stay in contact with the grape skins during fermentation for a longer time than with white wines, and the colour derives from complex polyphenolic compounds of the tannins present in the grape skin. I know of no chemical methods which would enable you to “identify” these tannins, and I doubt whether there’s any simple means of doing so.
See our Investigating Wines tutorial for further information.
Risk assessment
Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide appropriate control measures to reduce the risks. You must have these approved by those in authority in your school or college laboratory. Do not rely on what is said on this website.
For further guidance see our tutorial on Risk Assessment.
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updated: 29 January 2008
