Understand the Bleaching action of sulphur dioxide. Click on the Link to Watch the VIDEO explanation: Watch Video
Sulphur dioxide access is a bleaching agent and bleaches vegetable colouring matter in presence of moisture. You can observe here how moist flower looses colour. The bleaching action sulphur dioxide is due to its reducing action. The colour of pigment on exposure to SO2 gets reduced to a colourless compound. On standing in an air the colourless reduced product is reoxidised and gain the original colour. Bleaching with sulphur dioxide is therefore of temporary nature. It is generally used for bleaching delegate article like ivory, silk, wool etc.
Sulphur dioxide access is a bleaching agent and bleaches vegetable colouring matter in presence of moisture. You can observe here how moist flower looses colour. The bleaching action sulphur dioxide is due to its reducing action. The colour of pigment on exposure to SO2 gets reduced to a colourless compound. On standing in an air the colourless reduced product is reoxidised and gain the original colour. Bleaching with sulphur dioxide is therefore of temporary nature. It is generally used for bleaching delegate article like ivory, silk, wool etc.
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