Lac

Lac is the scarlet resinous secretion of the insect Laccifer lacca.

Laccifer lacca belongs to the family of scale insects and mealy bugs Coccoidea a large family of plant sucking insects. Thousands of these tiny insects colonize branches of suitable host trees and secrete the resinous pigment. The coated branches of the host trees are then cut and harvested as sticklac.

The harvested sticklac is then crushed and sieved to remove impurities. The sieved material is then repeatedly washed to remove insect parts and other soluble material. The resulting product is known as seedlac.

Seedlac which still contains 3-5% impurities is then processed into shellac by heat treatment or India, Bangladesh, Myanmar, Thailand, Laos, Vietnam and parts of China.

Host trees:

Laccifer lacca can be cultivated on either cultivated or wild host trees.

• In India the most common host trees are
  • Dhak (Butea monosperma)
  • Ber (Zizyphus mauritanea)
  • Kusum (Schleichera oleosa)
• In Thailand the most common host trees are
  • Rain tree (Samanea saman)
  • Pigeon pea (Cajanus cajan)
• In China the common host trees include
  • Pigeon pea (Cajanus cajan)
  • Hibiscus species

Uses:

The use of lac dye goes back to ancient times. It has been used in India as a skin cosmetic and dye for wool and silk. In China it is a traditional dye for leather goods. The use of lac for dye has been supplanted by synthetic dyes.

Shellac (the refined form of lac) is used in several industrial applications

• surface coatings
• textiles
• printing
• Cosmetics and pharmaceuticals
• Adhesives
• Electrical industry

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Lac is also the French word for "lake". It is the name of the Lac Prefecture of Chad

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Lac is also a less common way to spell lakh.

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Lac is also the name of a well-known operon for the metabolism of lactose in bacteria such as E. coli. See lac operon.

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Lac is also the name of a district in the canton of Fribourg, in Switzerland.