什麼是靛藍

Indigo is the color on the electromagnetic spectrum between about 420 and 450 nm in wavelength, placing it between blue and violet.靛藍是電磁光譜中波長介於450至XNUMX nm之間的顏色，位於藍色和紫色之間。 Although traditionally considered one of seven divisions of the optical spectrum, modern color scientists do not usually recognize indigo as a separate division and generally classify wavelengths shorter than about XNUMX nm as violet.儘管傳統上被認為是光譜的七個分區之一，但是現代色彩科學家通常並不將靛藍視為一個單獨的分區，通常將短於約XNUMX nm的波長分類為紫色。
靛藍和紫色與紫色不同，紫色在電磁光譜中看不到，但是可以通過混合大部分藍色和部分紅色來實現。
One can see spectral indigo by looking at the reflection of a fluorescent tube on the underside of a non-recorded compact disc.通過查看未記錄的光盤底面上的熒光燈管的反射，可以看到光譜靛藍。 This occurs because the CD functions as a diffraction grating, and a fluorescent lamp generally has a peak at 435.833 nm (from mercury), as is visible on the fluorescent lamp spectrum.發生這種情況是因為CD充當衍射光柵，並且熒光燈通常在XNUMX nm處有一個峰（來自汞），如在熒光燈光譜上可見。