Final answer:
Kirchner most probably achieved the strong black and white contrasts in Port Scene by using ink and wash.
Step-by-step explanation:
Kirchner most probably achieved the strong black and white contrasts in Port Scene by using ink and wash. Ink and wash is a technique that involves using ink to create bold, dark lines and then adding water to create lighter shades and gradients. This technique allows for strong contrasts between black and white, which can create dramatic and dynamic effects in a painting.