Page 22 Advertisement 1

New Zealand Listener, Volume 31, Issue 784, 30 July 1954, Page 22

W HITE HARVE ST In many countries salt is still made by the simple process of running sea-water into large shallow ponds and allowing it to evaporate in the heat of the sun. The rate at which sea-water evaporates depends mainly on the amount of sunlight which it absorbs, but in normal circumstances much of the sun S heat is lost by reflection from the surface and bottom of the pond; It has been found, however, that if certain dyestuffs are added to the water more sunlight is absorbed and the rate of evaporation can be increased with- out affecting the colour of the salt_ An enquiry from a customer using a dyestuff for this pur- pose led LCI: to carry out a large number of tests, which ultimately resulted in the marketing of "Solivap' Green-a dye outstanding in both light-fastness and the power to absorb radiation, and thus the most satisfactory for speed- ing-up evaporation. Practical trials at the Osborne salt works of ICI: Australia and New Zealand Ltd. showed that the use of 'Solivap' Green in the final evaporation ponds increased the yield of salt by 209 and correspond- ingly decreased production costs. Today, "Solivap' Green 1S helping to increase salt production in countries as far afield as Africa, Australia, Brazil and India. ICI IMPERIAL CHEMICAL INDUSTRIES (NZ) LTD: HANSELL's "Oehingue Whit When the price of eggs goes too high you can still make and enjoy the most delicious MERINGUES and PA VLOVA CAKES by using HANSELLS MERINGUE WHIP instead of eggs. Ea WAS MANSELL PrIGe Revugep I9 MHEriNcue You can also make NOW Whip delicious butter filling with Hansell' $ Meringue Whip at a fraction of I6 the cost of cream: HANSELL LABORATORIES LTD. MASTERTON 3.4