(i) Alum, glass, soda, potash, alginic acid and soap are made from seaweed kelp.
(ii) Ice-creams, jellies, paints, varnishes, shampoos and cosmetics are made from olgin of brown algae and gelatin of red algae.
(iii) Soap, paper, photography, rayon etc. are made from algae agar.
(iv) Polymers like starch and polyhydroxy-alkanoates are formed naturally in algae. Bioplastics are made from all these polymers.
(v) Carrageenan from algae (Chondrus crispus) is used in food processing, rayon, pharmaceutical industry, leather industry, toothpaste and dyes.
(vi) Algae (Furcellaria) furcellaran is used in making jam-jelly, preserving fish and meat and in toothpaste and pharmaceutical industry.
(vii) Algae (Gleopeltis furcata) is used in pulp and paper industry and for making glue.
(viii) Iodine and potash are produced from Laminaria algae.