<span>The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.</span>
If you apply white light and it reflects only red, you see it red, all the other wavelentghs absorbed. If it reflects all wavelength (i think listed all red-orange....) then it should be white.
Say for instance packaged ground beef meat or ground turkey meat. u could use a bio degradable packaging instead of styrofoam and plastic.
the higher the altitude, the lower the oxygen available.
Oxygen would be the best answer