For a pure component the density difference between a liquid and gas approaches zero as the critical point is approached. By definition liquid and gaseous phases are indistinguishable (meaning no difference) at the critical point.
-- Frequency -- Wavelength. -- Speed. While each of these may vary their inter-relationship does not. Frequency - V Wavelength -L Speed - c VL=c is always true. c= varies depending on the medium...
Never add too much. Always start with a small amount and add to it. Also, you need to know what you are coloring. Use the correct type of food coloring for the item you are coloring. EG use liquid in...