I posed a question to a restorer friend about paint colors that have a particularly wide range of value, or brightness, from the highlight areas to the shadows. The original candy colors have this property, but there are a number of metallic or pearlescent production colors that have appeared in the last few years that also have this quality. Some silvers and metallic greys are good examples of this. Bob said that the term for this is "flop". There may be other technical or trade terms for it, but flop works for me. Here's an example of a Nissan color called "Mystic Emerald" that's on my '56. I chose this color in the first place because it has a LOT of flop, so it appears in some light to be a pale green with a silvery cast, and in lower light to be kind of pewter grey. In sunlight, both light and dark are visible at the same time. In this picture, notice the contrast between the top of the deck lid (light) with the corner where it turns downward (dark): My question is directed at any of you who are knowledgable about mixing paint. Is this flop caused by a high proportion of metallic, or the coarseness of the metallic, or the various pigments in the blend? I don't know if this will confuse this issue, but it's in my mind: gloss black, when highly polished, also reflects a tremendous range of values from highlights to dark shadows, and any very glossy paint will also have a range of brightness in its surface reflections. The flop that I'm inquiring about is not a function of surface gloss; it's something about the pigments and additive particles in the base color. Can anybody help explain this to me?