Schoolboy patrząc na kolbę z czerwoną cieczą, pisanie danych reakcji w kopii książki - Materiał filmowy & wideo

Schoolboy holding flask with red liquid and scratching head, wrong reaction

Confused schoolboy shrugging shoulders, dirty face after chemical experiment

Little scientist comparing flasks with blue and red liquids, experiment result

Young scientist makes experiment with liquid. He blows air through a tube and the liquid in flask changes color. Laboratory chemical experiments.

Young scientist makes experiment with liquid. He blows air through a tube and the liquid in flask changes color. Laboratory chemical experiments.

Rack focus of cute boy in laboratory

Schoolboy holding flask with red liquid and scratching head, wrong reaction

Confused schoolboy shrugging shoulders, dirty face after chemical experiment

Little scientist comparing flasks with blue and red liquids, experiment result

Little schoolboy checking test tube with violet liquid at chemistry lesson

Dirty schoolboy looking at camera at chemistry lesson, faulty experiment results

Schoolboy looking at sediment in flask and writing results, chemistry lesson