what makes powders white?
eon 01 Feb 2014
I was just curious why powders are usually white. From medicines to anything else that is in powder form. I'm not familiar with chemistry is why I ask this question. I'm sure before anything is "powdered" it had to be some form of liquid at some point, like powdered milk.
Jeoshua 01 Feb 2014
The two most popular colors for powders are white and yellow, mainly because these are the colors our eyes will pick up on most readilly.
trance 01 Feb 2014
This light activates all of the color sensing type cones in your eyes on equal levels, resulting in the perception of white in your brain.
Substances that absorb various visible light frequencies will be perceived as different colors depending on what light is absorbed and what is reflected back.
niner 01 Feb 2014
PWAIN 02 Feb 2014
eon 02 Feb 2014
Think of it like a sheet of glass. It starts off clear (like a crystal). Break it into pieces and start to crush it and it starts to look more and more white until as a fine powder it looks pure white. Same concept, different starting crystal.
PWAIN 02 Feb 2014
eon 02 Feb 2014
White powder is just hard crystals of material too small to have any optical effects. You can get "rainbow" powders, too, if the powder is flaky, scaly, and of varying thickness.
The two most popular colors for powders are white and yellow, mainly because these are the colors our eyes will pick up on most readilly.
OK. The PEA powder I have looks more crystal than powder (either way it's white). I guess this wasn't finely crushed then huh? But it's still white.
Think of white sugar or salt. These are all clear crystals that are finely crushed. This causes the light to scatter in such a way that white light is reflected.
PWAIN 02 Feb 2014
Sugar is more coarse than salt but still white. Different crystals will have different properties like how much they bend light and scatter it. This can also affect the end colour.
eon 02 Feb 2014
Think about coloured crystals eg imagine crushing an emerald or sapphire. These would have the colour tint show through.
Jeoshua 02 Feb 2014
niner 02 Feb 2014
what do you mean by color tint? It would look like emerald or sapphire, but tinted (so darker in appearance, not white)?
White light is a mixture of all the colors of the rainbow.
If you crush a red crystal, you will get a red powder.
If you crush an orange crystal, you will get an orange powder.
If you crush a yellow crystal, you will get a yellow powder.
If you crush a green crystal, you will get a green powder.
et cetera.
Almost all pure compounds form crystals, and light can penetrate them to a greater or lesser degree without being scattered. In other words, they are "clear", meaning transparent. "Clear" is not the same thing as "colorless". If some frequencies of light are absorbed more than others, the crystal will have a color, but still be transparent. Example: "A clear, red crystal." Although the light passes through these crystals, it will almost always be bent at the edge of the crystal where it passes from air to the crystalline substance. Since all the photons are bent in the same direction, the image we see through it is not distorted. When you are looking at a pile of millions of tiny crystals, the light is bent in a different direction by each of them, since they are lying in different orientations. If the crystals are colorless, then the light that you see is a mixture of all frequencies, so it looks white.
eon 17 Mar 2014
niner 17 Mar 2014
what makes some of these powders have similar taste like dmae and alcar and vitamin C powders all have that citric taste to it? Is citric acid the base of it?
Acids taste sour, and vitamin C and citric acids are both hydroxy acids, so that probably explains their similar taste. If the DMAE is in the salt form (hydrochloride would be typical) then it too is acidic in water, (though not technically an acid), and it also has one hydroxyl group. If it's in the free base form, I don't know why it would taste like citric acid. Alcar can break down into carnitine and acetic acid, so you might be tasting a bit of acetic acid, but it might have something to do with the structure of carnitine itself, which is also a hydroxy acid.
eon 17 Mar 2014
Jeoshua 18 Mar 2014
Adding a base to that acidic water can neutralize it further, but can also cause a reaction with the supplement, and may denature it in some cases.
Edited by Jeoshua, 18 March 2014 - 12:45 AM.
SIRT1 25 Nov 2014
EDIT: retracted the post - niner already covered it..
Edited by SIRT1, 25 November 2014 - 09:11 AM.