The time it takes from eating food to excreting it is called the “gut transit time”. Researchers gave participants muffins dyed with strong blue food colouring, turning their poo blue ...

1. Carefully pour some milk in a dish so it just covers the bottom. 2. Gently add one or two drops of red, blue, and yellow food coloring to the same spot in the center of the milk. 3. Dip a cotton ...

Household bleach reacts with a solution of green food coloring to first oxidize the yellow component of the dye, leaving only the blue coloring. Eventually, the blue dye is also oxidized, and the ...