RFK Jr., 72, has not explained what the liquid was or whether ... methylene blue lost popularity. Today, it is mainly used to clean fish tanks and treat a rare blood disorder called ...

This blue liquid is your indicator solution for the chemistry experiment. Next, pour about 1 tablespoon of the indicator into each of three clean clear plastic cups. Add 1 drop of lemon juice to the ...

Formalin is a clear liquid made by dissolving formaldehyde gas in water ... scientists chose a new method for the fish. The blue marlin spent three weeks in a large tank of formalin and glycerol to ...

Kennedy Jr. using a bright blue liquid sparked widespread curiosity about ... methylene blue still finds use today—in laboratories, aquariums (as a fish tank disinfectant), and niche medical ...