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

Question

Quizplus · Accepted Answer

A reference film is used to check solution strength in the darkroom because it provides a visual representation of the solution's strength. The film is exposed to the solution and then developed, and the resulting image can be compared to a reference image to determine the solution's strength.

An Easy Way to Check Solution Strength in the Darkroom