Brother DCP-310CN - Manual (Page 25)

2 - 2 MAKING COPIES
Using the Copy keys
(Temporary settings)
When you want to quickly change the copy settings temporarily for
the next copy, use the temporary Copy keys. You can use different
combinations.
These settings are temporary, the DCP returns to its default
settings 60 seconds after it finishes copying.
You can save the copy settings you use most often by setting
them as default. (See Changing the default copy settings on
page 2-12.)
Temporary Copy keys