Twilight
Twilight - when the sun is below the horizon but its light can be seen - occurs in the morning just before sunrise and in the evening after sunset. The word is most commonly used of evening. The available light is from light rays that illuminate "sky particles": matter such as dust, ash, or water in the form of mist or cloud.
At dawn, the light first filters across the sky before the sun rises over the horizon. At sunset, after the sun has sunk below the horizon, the sky colours remain until overcome by the ink-blackness of night. Because the sun's rays are oblique and the "sky particles" act as minute reflectors, the colours, looking towards the sun, are more intense: how intense depends on the amount and density of clouds and other reflective particles.
Colours may appear so surreal that viewers assume coloured filters have been used. In fact I once overheard two American tourists discussing a book of spectacular dawn and dusk effects. The woman wanted the book; the man argued that it had been misprinted, as the colours were all "funny". The book, by renowned photographer Peter Jarver, contained glorious, completely natural images from the Top End, an area well known for the drama of its skies.
Camera shake can be a problem during the long exposures required in low light situations. To overcome it, use a tripod with a cable release or set the self-timer for a 2/5 second delay. Then, as long as the subject is not moving, you will be able to reduce shutter speed quite considerably. If the subject is moving, then a faster lens (a fast lens is one designed for such circumstances and it has a small f-stop number such as f2.8 or f1.2) or an even faster film could be considered.
Above: Both snow and rocks on this alpine peak reflect the western colours of evening twilight. [135/24 mm, f4, 1/60 sec., airborne].
A gum blossom image exposed during twilight. Even though the depth of field is short, this image has a magic appeal. [135/200 mm micro, f5.6, 1/30 sec., tripod and cable release].
A full moon rises as the last light of twilight fades [135/105 mm, f4].
The colours in this photograph of the renowned north-western "stairway to the moon" are quite natural. Be aware, however, that exposing some colour films for longer than 30 seconds can cause reciprocity failure - that is, the dye in the colour film reacts in such a way as to cause a colour cast [135/500 mm, 1.4 converter, f5.6].