Color from pigments is created through the process of selective absorption and reflection of light. Pigments are substances that have a specific molecular structure allowing them to absorb certain wavelengths of light and reflect others. The colors that we perceive are the wavelengths of light that are reflected by the pigment and not absorbed. In essence, a pigment that absorbs all wavelengths except for the ones corresponding to green will appear green to the human eye. This process is fundamental in a range of applications such as painting, printing, and in the natural coloring of materials. Different chemicals and compounds serve as pigments, each providing unique colors depending on their molecular structure and the light they absorb. Mixing different pigments can create new colors through the additive or subtractive color processes, enabling a vast spectrum of colors to be produced.

Amino acids are organic compounds that serve as the building blocks for proteins, critical for life. In total, there are 20 standard amino acids encoded by the universal genetic code, essential for protein synthesis. However, more than 500 amino acids are known, with roles in various metabolic pathways and non-protein functions in organisms. Of the 20 standard amino acids, nine are considered essential for humans because our bodies cannot synthesize them, and they must be obtained through our diet. These essential amino acids include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The remaining 11 are classified as non-essential because our bodies can produce them. Understanding amino acids' diversity and function is crucial for nutritional science, biochemistry, and medicine, highlighting the complexity and elegance of biological systems.

The expiration date of Kodak DAK ink can generally be found printed on the ink cartridge packaging or directly on the cartridge itself. Manufacturers like Kodak print expiration dates to ensure optimal print quality up to that point. The date format might differ, but it usually includes the year and month. If you're unable to locate the expiration date or the print is faded, consulting the Kodak customer support with your ink cartridge model number can help. It's advisable to use ink before the expiration date to maintain print quality and prevent potential damage to your printer.