A student has four test tubes in a rack. The student adds 5 mL of a sodium bicarbonate/water solution to all four test tubes along with two drops of Phenol Red pH indicator. The student places a small 8 cm clipping of an aquatic plant Elodea into two of the test tubes. One tube with plant and one tube without plant is wrapped in tin foil. All four tubes are placed in near a light source. What is the purpose of the tin foil in this experiment

Tin foil, which is produced from a thin leaf of the metal, was first made commercially available before aluminum foil. From the end of the nineteenth to the beginning of the twentieth centuries, tin foil was professionally marketed. The older aluminum foil is still referred to as "tin foil" in the English language.
Because tin foil is made of tin, it turns out that the words tin foil and aluminum foil are not synonymous. The substance's popularity peaked in the late 1800s and persisted into the 20th century, but a major drawback was that it left meals with a "tinny" taste.
Aluminum is made into modern foil by rolling it through a continuous mill, which makes the metal longer and thinner. This procedure reduces thickness, and at the conclusion of the production line, the aluminum product is twisted into a coil. Then, in cold rolling mills, these coils are cold rolled.

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