Drawing with iodine. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
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Drawing with iodine. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

What is especially good about this experience is that everything you need for it is probably at home: a candle, a pharmacy bottle (alcohol solution, iodine tincture) and some worthless iron object - an old door hinge, a key to an unknown lock or a lock whose keys are lost . Sand the metal surface on which the drawing will be with an emery cloth to a shine, light a candle and tilt it so that the paraffin drips onto the shiny surface. Slightly heat the object, then the paraffin will spread in a thin layer. And when it cools and cools down, scratch the grooves with a needle so that they reach the metal. Type pharmacy iodine with a pipette and drop it on scratches. After a few minutes, the iodine solution will turn pale, and then you need to reapply it to the scratches. After about an hour, remove the paraffin layer: you will see clear traces on the metal, they exactly repeat the pattern on the paraffin.

If the experience was successful, you can move on to a more serious task - not just scratching the paraffin, but writing a word or drawing on it, for example, mark your penknife or bicycle wrench.

Let's figure out what happens when iodine comes into contact with metal. Iron reacts with the hearth, resulting in the formation of a salt - iron iodide. And this salt is a powder that is easily removed from the surface. And where there were scratches, depressions formed in the metal. This process is called chemical etching. It is often resorted to, but usually not iodine is used, but other substances that are more active.

By the way, iodine interacts not only with iron, but also with copper. This means that they can pickle various objects made of copper and copper alloys, for example, brass. You can try.

Author: Olgin O.M.

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