Chris, I’ve been shooting this phenomenon for 7 or 8 years (e.g. here) and there are at least two other NPN members who do this on occasion. The saturation of the diffractive colors depends on the species of spider and strongly on the angle between the camera, web and sun. You did well here with those two streaks of strongly saturated colors. (The spider species matters because the strength and brilliance of this effect depends on the diameter of the silk strands.)
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