Ключевые слова: background, black, burette, cartoon, chemicals, chemistry, coloring, composition, doodle, drawning, education, elements, experiment, experiments, filler, flask, glass, illustration, laboratory, lesson, lettering, material, objects, outline, pattern, pharmacy, pipette, pounder, reagents, school, science, seamless, sketch, square, test tube, testtube, textile print, thermometer, wallpaper, weighing bottle, white, wrapping,