To assess the quality of fresh fish and seafood, there are a few simple things to look for: Fresh whole fish should have bright, clear eyes; skin should be shiny, firm and elastic to the touch, gills should be red not brown, and if gutted, the cavity should be clean.o assess the quality of fresh fish and seafood, there are a few simple things to look for: Fresh whole fish should have bright, clear eyes; skin should be shiny, firm and elastic to the touch, gills should be red not brown, and if gutted, the cavity should be clean.
Drying oil. A drying oil is an oil that hardens to a tough, solid film after a period of exposure to air. The oil hardens through a chemical reaction in which the components crosslink (and hence, polymerize) by the action of oxygen (not through the evaporation of water or other solvents). Drying oils are a key component of oil paint and some varnishes.
Answer   Linseed oil doesn't actually dry in the usual sense - it oxidises, reacting with air to form a dry film. This can take several days to be touch-dry, and the reâ¦action continues for a long time, making the film gradually stronger. The drying time depends on many factors, including the purity of the oil, whether it is polymerised or heat-bodied, and so on.