1 For severe stains, add 1-2 cups vinegar to the wash cycle as well. 2  To remove a rust stain from your cotton work clothes, moisten the spot with some full-strength vinegar and then rub in a bit of salt. 3  If itâs warm outdoors, let it dry in the sunlight (otherwise a sunny window will do), then toss it in the wash.
absorption spectrum - the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths. spectrum - an ordered array of the components of an emission or wave.
An emission spectrum is the electromagnetic radiation (EMR), such as visible light, a substance emits. Every element gives off a unique fingerprint of light, so analyzing the frequencies of this light helps identify the chemical that generated it.bsorption Spectra. It is important to distinguish between emission and absorption spectra. In an absorption spectrum, some wavelengths of light are absorbed as they pass through a gas, forming a pattern of dark lines against a continuous background.