Yes, farmed steelhead trout are often fed a diet that includes a type of pigment to color their flesh, similar to the way farmed salmon are treated. In the wild, steelhead and salmon obtain their vibrant pink or orange flesh color from eating crustaceans and other marine organisms rich in carotenoids, specifically astaxanthin. The pigments added to the feed of farmed fish are usually synthetic or naturally derived forms of these same compounds. This practice is primarily for consumer appeal, as many consumers associate the pinkish-orange color with the quality and type of fish. It's important to note that these dietary additives are regulated and deemed safe for consumption by meities like the FDA in the United States. However, the ethics and health implications of consuming dyed fish are subjects of ongoing debate among consumers and health advocates.

Yes, polypropylene is an olefin. Olefins, also known as alkenes, are hydrocarbons containing at least one carbon-to-carbon double bond in their structure. Polypropylene is generated through the polymerization of the monomer propylene (an alkene), which contains one double bond between two carbon atoms. This process transforms the monomer's double bond into a single bond, linking multiple propylene molecules into long molecular chains. Thus, since polypropylene originates from an olefin, it is considered to be part of the olefin family. Polypropylene is widely valued in various industries for its stiffness, resistance to various chemical solvents, acids, and bases, and its versatility in manufacturing applications.

Mixing emulsion paint (water-based) with eggshell paint (usually also water-based with a bit more sheen) is technically feasible as long as both are of the same base (water-based in this case). The aim might be to adjust the sheen level or color of the existing paint. However, it's crucial to mix them thoroughly to ensure uniform color and finish. Additionally, consider the underlying surface and intended use since the mixture's durability might differ from standard finishes. Always test the mixture on a small area first to ensure the desired outcome.