Abstract: A sulphur dioxide generator is disclosed which comprises two sheets of synthetic or other material which are laminated together by a laminating substance. Dispersed in the laminating substance is a material which, in the presence of moisture, generates sulphur dioxide. The sheets are pervious to water vapor and sulphur dioxide and can be of natural, synthetic or semi-synthetic sheet material. Suitable sheet materials are polyester, polypropylene, polyethylene, cellulose, paper, cellulose acetate or regenerated cellulose foil.