Red and orange light probably have similar wavelengths so, in poor light, red seems to be orange. To be honest, I thought that orange looked red in poor light.
If it appears orange, then why in the world do you call it a "red" shirt ?
A yellow shirt in red light would appear to take on a more orange hue due to the way light interacts with different colors. The red light would mix with the yellow of the shirt, creating the appearance of orange.
The visible red light has a wavelength of about 650 nm. At sunrise and sunset, red or orange colors are present because the wavelengths associated with these colors are less efficiently scattered by the atmosphere than the shorter wavelength colors (e.g., blue and purple). A large amount of blue and violet light has been removed as a result of scattering and the longwave colors, such as red and orange, are more readily seen.
A white shirt is, basically, reflecting all colours of the electromagnetic spectrum which it is exposed to. So for white light it is reflecting red, orange, yellow, green, blue, indigo, violet. If you only expose it to red light (with a wavelength of ~650nm), it will reflect only that light. Therefore, the white shirt will appear red.
When a blue shirt is in red light only, it may appear very dark or nearly black because the red light does not contain the wavelengths needed to reflect the blue color of the shirt. Instead, the shirt will absorb most of the red light, causing it to appear dark.
It will appear somewhat Orange. This is due to the roughly 650nM wavelength from the red light and the reflection of the yellow at around 380nM.
The red shirt would appear darker than normal in the dark room, possibly looking like a darker shade of red or even black to the people with him in the room.
Orange
A red shirt primarily reflects red light. When white light (comprising all colors of the spectrum) shines on the shirt, the red fabric absorbs all colors except red, which is reflected back to our eyes, making the shirt appear red.
His regular T-shirt in the TV series is a red- orange colour. Sometimes in the comics he wore a blue shirt. =]
purple-redish-blueish need more acuracy plz :)
A green t-shirt will appear darker and less vibrant under a red light due to the way the human eye perceives color. The red light will make the green shirt appear more subdued as the red light will reflect off the green fabric and alter its appearance.
In red light, an orange object will appear darker and less vibrant compared to how it would appear in white light. The orange color has components of red and yellow, so the red light will emphasize the red tones in the object, making it appear more reddish-brown or even brownish, depending on the intensity of the red light.