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This experiment is an easy source of protozoa for your regular microscope or your laser microscope. You can even see some of them with a good magnifying glass.
It can also lead to some interesting investigations and science projects.
At first, many people find luster a bit confusing. Luster is the way that an object reflects light, and although the different types of luster can be difficult to describe, your daily experience makes them easy to recognize. Once you understand luster, you will recognize the common lusters instantly.