A percentage solution is a liquid mixture in which a specific quantity of a substance is dissolved in a defined volume of solvent, expressed as a percentage. This measurement indicates the concentration of the solute relative to the total solution, commonly used in photographic chemistry, including developing and fixing solutions.
For example, a 10% solution contains 10 grams of solute dissolved in 100 millilitres of solvent. Understanding and preparing accurate percentage solutions is essential for consistent chemical reactions in photography, ensuring predictable results in film development, printing, and other photographic processes.