An easy way to check solution strength in the darkroom is with:
A)a step wedge.
B)a thermometer.
C)a reference film.
D)an ionizing chamber.

Question

Quizplus · Accepted Answer

A reference film is used to check the consistency and strength of the solution in a darkroom by comparing the density of a current film to that of the reference film. This method does not require light, making it suitable for darkroom conditions.

An Easy Way to Check Solution Strength in the Darkroom