Steps To Preventing A Black Fabric From Fading. Pt2

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Stick with the shortest cycle possible.[2] Essentially, just as you should wash your black clothes as infrequently as possible, you should also make those washing cycles as brief as possible. The less time your clothes spend in the washing machine, the less chance the dye has to run and fade.
A delicate cycle works well when in doubt, but as a general rule, you should still choose settings that are appropriate based on how soiled the clothes are and the type of fabric the clothes are made from.

6
Add a specialized detergent. Nowadays, there are special detergents that are formulated for use with dark fabrics. These detergents help hold the dye in place during the washing cycle, so that dye is less likely to run and the clothes are less likely to fade.
If you do not use a detergent labeled for dark colors, use one formulated for cold water loads. These detergents can partially neutralize the chlorine in tap water, which is important since chlorine bleaches and lightens black clothes.
Note that detergents do not necessarily contribute to fading, even though some help prevent it more than others. Any liquid detergent is suitable, but you should not use any bleach.
Liquid detergents work better than powder detergents in cold water. Powders tend not to dissolve completely in cold water, especially when you use a short cycle.

7
Skip the dryer. Heat is the enemy when you are trying to prevent black clothes from fading. Black clothes should be hung to dry or laid flat to dry. Avoid using the dryer unless absolutely necessary. If you must use the dryer, skip the fabric softener sheet if possible.
When you line dry black clothes outside, make sure that you place them in an area away from the sun. Sunlight acts as a natural bleach, which will fade your black clothes faster.
If you do need to use the dryer, use the lowest temperature possible based on the type of material the clothes are made from. You should also watch the clothes carefully to make sure that they do not become over-dry or too warm. Remove the clothes while they are still slightly damp to be on the safe side.