Use this to get the deepest cold blacks, blue blacks by adding slightly more of the solution. The deepest blacks are heightened without any loss of tones in the deepest shadows.
Example: A warm tone paper like our SELECT SEPIA VC can produce neutral tones when you use SE6 BLUE. But you can also to produce colder tones on this very finely grained paper. For this add 5-10 ml Finisher Blue per litre of working solution. The resulting tone will change to a colder tone, if you use more than 10 ml per litre to bluish black tones.
If you use more than 10ml/litre you need to extend the exposure time.