Boiled seeds are treated with formalin to prevent microorganisms from growing on them and decaying the seeds.
Formalin:
When formaldehyde is dissolved in water, it is called formalin, commonly used as an industrial disinfectant and a preservative in funeral homes and medical labs.
It can also be used as a preservative in foods and products, such as antiseptics, medicines, and cosmetics.
These have been found in cosmetics, soaps, shampoos, lotions, sunscreens and cleaning products.
To improve the yield of fuels, it is used in the petroleum and natural gas industries.