The scientific man does the test with chemical liquids. He uses a dropper pouring in test tube
lab dropper in test tubes
Scientist injecting chemicals into test tubes. Test tube of colored liquid on the lab table in the background of the glass flasks. poured from glass pipette into test tube illuminated with blue light
Scientist injecting chemicals into test tubes. Test tube of colored liquid on the lab table in the background of the glass flasks. poured from glass pipette into test tube illuminated with blue light
Scientist injecting chemicals into test tubes. Test tube of colored liquid on the lab table in the background of the glass flasks. poured from glass pipette into test tube illuminated with blue light
Scientist injecting chemicals into test tubes. Test tube of colored liquid on the lab table in the background of the glass flasks. poured from glass pipette into test tube illuminated with blue light
Scientist injecting chemicals into test tubes. Test tube of colored liquid on the lab table in the background of the glass flasks. poured from glass pipette into test tube illuminated with blue light
Scientist injecting chemicals into test tubes. Test tube of colored liquid on the lab table in the background of the glass flasks. poured from glass pipette into test tube illuminated with blue light
Selective focus of blurred scientist in gloves, goggles and face mask looking at test tube with blue liquid, taking sample with dropper from it
Pipette dropping sample into test tube
Chemist pouring liquids in test tubes on table with pipette. Researcher dropping chemical liquid in test tubes. Close up of scientist hands working with chemical reagents at research laboratory
vintage scientist adding a blue liquid to a test tube