A capped 2-liter plastic bottle containing a clear, colorless liquid is shaken. The liquid turns a deep blue color. At rest, the liquid returns to colorless. The cycle can be repeated many times. Ask ...

Liquid colors are the classic choice, typically found in small, squeezable bottles. As the name suggests ... Both types will ...

Besides blue, the colour felines see most clearly ... orange and purple. So how come the bottle with red liquid tactic works for some people? There are two reliable explanations behind this ...