The Kramer Effect, coined by Purgatorian scientists studying the effects of anomaly on electromagnetic waves, is an anomalous effect exhibited on all photons and tachyons passing through anomalous areas. The Kramer Effect observes that photons passing from an area into an area that has a different ECF will be diffracted and scattered, changing wavelength and thus color. This effect becomes more apparent the greater the cuil difference the light passes through and the quicker that cuil difference is. The effect is barely noticeable to the eye when passing into most high ECF areas, but areas that have a very defined border in which the high ECF begins will appear to have a prismatic 'membrane' of multicolored light. The places this effect is extremely noticeable are hyperlanes, which accounts for the prismatic membrane that makes up hyperlane borders.
The Kramer Effect can become a problem when attempting to communicate between areas of differing ECF, as it can cause radio waves to diffract and become incoherent if the difference is large enough. It even affects tachyons, though to a lesser extent. Transmissions become incoherent at an ECF difference of around 10‽.
The Kramer Effect is mathematically defined within Cuil Theory as an intensity over a cuil gradient within the total membrane of distorted light, referred to as a "Kramer veil" or "K-veil". The intensity is the total change in cuils over the gradient, measured in dB‽ (decibel-cuils) and is directly correlated to the distortion applied to light passing through the K-veil. The gradient is the total thickness of the K-veil, typically measured in centimeters. The gradient and the intensity of a K-veil can differ; a K-veil can have a very wide gradient but low intensity, meaning the veil effect appears as only a faint distortion. A very thin K-veil of, for example, a few micrometers with a very high intensity however may be impossible to even see through due to the intensity of the distortion present, simply appearing as a dome of pure white light. These cases are extreme however, and most K-veils will be in the range of tens of centimeters or less and intensity under 20 dB‽. Some K-veils can even be invisible to the naked eye if their intensity is low enough or their gradient is high enough, detectable only with sensitive instruments in the faintest of cases.
The K-veils composing the borders of hyperlanes are incredibly intense, with gradients ranging from hundreds of meters to 1 AU depending on the size of the hyperlane. The intensity of these K-veils can reach over a hundred dB‽.
There is still plenty of research left to conduct regarding K-veils, such as how they potentially form around subspace anomalies and how they can be detected with astronomical spectroscopy, or how trace amounts of cuil flux can be sometimes found within K-veils.