Shakeable ink. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
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Shakeable ink. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

Dissolve the starch in water until cream thick and add iodine to it.

The starch will turn blue. If more iodine is added, the solution will turn almost black. "Ink" is ready. Write any phrase on paper with them and let dry. Then click on the paper with your finger or wipe it with a clean, dry cloth - the writing will disappear.

Author: Shkurko D.I.

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It has long been noticed that weeds grow much faster than cultivated plants, are not afraid of pests, diseases, drought and do not require fertile soils. Spain intends to use this vital force of harmful plants.

In two provinces in the north of the country, by 2002, they are planning to build power plants that will use thistles as fuel for their boilers. Each of the two thermal power plants will need one hundred thousand tons of weed per year. To do this, they plan to sow 5000 hectares of waste arid land with thistles, where nothing else can grow. Moreover, the Spaniards intend to use a specially bred giant variety of prickly weed: its stems are up to three meters high, and the roots go seven meters into the soil.

Breeders from the Agricultural Institute in Madrid at first failed: the bred thistle variety was too sweet, and its sprouts were willingly eaten by field mice. Then a gene that gives bitterness was introduced into the plant, and the mice fell behind.

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