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Hi there! Dr. Wagner is pouring ethanol in the tube before the turmeric. The turmeric will fluoresce without it, but the ethanol allows the turmeric to fall through the tube more easily than water.

This is also the question that I have. My teacher asked us this question in class and afterwords she said that fluorescent substances emit radiation of a LARGER wavelength (less energetic) than the one that was absorbed, and this happens because while the electron is in the excited state it may lose energy (for example, due to vibration). I'm just trying to understand if this always applies and is the definition of a fluorescent substance but no videos seem to op mention it. I guess that's it

Yup I am also wondering the exact same thing I can't find any information.

@@Austin1-0-8 Something having a color is due to the wavelengths that aren't absorbed by the object. Fluorescence is similar but it's more intense because it's caused by short wavelengths exciting electrons in certain molecules or elements and those elements emitting photons when they lose the excited state. The color they emit is based on what molecule or element and the isotope of that element is present.

Absorb shortwave -> emit longwave : fluorescent Abosrb shortwave -> emit shortwave : just color

One is emitting light and the other is reflecting light. If you turn off your light source, you will not see the object that is yellow. However, the object that is glowing (fluorescing here) is itself a light source.

I have located the correct answer to this question as I have been trying to find it myself. The answer is floresence are special colors that absorb and emit MORE light than conventional colors thus making them bright and vibrant. This is the difference because it uses more light from the uv and lower wavelengths as well It glows. You can find the answer if you google this "why is floresence bright" I don't understand why it is so hard to find such simple answers sometimes, but that is the answer, it is the same process of electrons rising and lowering energy emitting photons, just it absorbes more light which rises more electrons and thus MORE photons get emitted making it brighter. I hope that helps.

​@@kitsukeita No. If it would be then the colour of the non-fluorescent dye wouldn't be complementary In fluorescent dyes light is getting absorbed in shorter wl and light of a shorter wl is getting send out by the molecule. In "normal" dyes, special wavelength getting absorbed by the molecule. The rest of the wavelength shines threw or is getting reflected or whatever. And the colour we see is the complementary colour, cause all the remaining wavelengths which aren't getting absorbed are the combination of the "rest"