3. In the fermentation and preservation of pure wine, and during the operations of fining or clarifying, removing defects, improving qualities, blending and maturing, no methods shall be employed which essentially conflict with the provisions of the preceding sections of this Act, and no materials shall be used for the promotion of fermentation, or the assistance of any of the operations of wine treatment which are injurious to the consumer or the reputation of wine as pure; _provided_, that it shall be expressly understood that the practices of using pure tannin in small quantities, leaven to excite fermentation only, and not to increase the material for the production of alcohol; water before or during, but not after fermentation, for the purpose of decreasing the saccharine strength of musts to enable perfect fermentation; and the natural products of grapes in the pure forms as they exist in pure grape musts, skins, and seeds; sulphur fumes, to disinfect cooperage and prevent disease in wine; and pure gelatinous and albuminous substances, for the sole purpose of assisting fining or clarification, shall be specifically permitted in the operations hereinbefore mentioned, in accordance with recognised legitimate custom. 4. It shall be unlawful to sell, or expose, or offer to sell under the name of wine, or grape musts, or condensed musts, or under any names designating pure wines, or pure musts as hereinbefore classified and defined, or branded, labelled, or designated in any way as wine or musts, or by any name popularly and commercially used as a designation of wine produced from grapes, such as claret, burgundy, hock, sauterne, port, sherry, madeira, and angelica, any substance, or compound, except pure wine, or pure grape must, or pure grape condensed must, as defined by this Act, and produced in accordance with and subject to restrictions herein set forth; _provided_, that this Act shall not apply to liquors imported from any foreign country, which are taxed upon entry by custom laws in accordance with a specific duty and contained in original packages or vessels and prominently branded, labelled, or marked so as to be known to all persons as foreign products, excepting, however, when such liquors shall contain adulterations of artificial colouring matters, antiseptic chemicals, or other ingredients known to be deleterious to the health of consumers; _and provided further_, that this Act shall not apply to currant wine, gooseberry wine, or wines made from other fruits than the grape, which are labelled or branded and designated and sold, or offered or exposed for sale under names, including the word wine, but also expressing distinctly the fruit from which they are made, as gooseberry wine, elderberry wine, or the like. Any violation of any of the provisions of any of the preceding sections shall be a misdemeanour.