Acq fluorescence probe composition, cmc determination method, stain cleaning concentration determination method, detergent dispensing control method, and detergent dispensing control system

An ACQ fluorescence probe composition, characterized in that the ACQ fluorescence probe composition is a probe solution for directly determining a critical micelle concentration (cmc) of a surfactant and comprises a probe molecule and an auxiliary agent, and further that the probe molecule is dissolved in the auxiliary agent, wherein:

• the probe molecule is one kind of fluorescent molecule having an aggregation-caused quenching (ACQ) property with a luminescence strategy based on a change in fluorescence intensity or a change in characteristic wavelength, selected from the ling consisting of:
• an ACQ molecule with a blue-shifted characteristic wavelength and an ACQ molecule with an unchanged characteristic wavelength but a changed fluorescence intensity,
• a Hansen solubility parameter (HSP) δ of the probe molecule is 20 (MPa)1/2 to 25 (MPa)1/2,
• the auxiliary agent comprises one or more non-volatile organic solvents having a boiling point above 100° C. and is soluble or easily soluble in water;
• and
• a Hansen solubility parameter (HSP) distance (Ra) between the probe molecule and the organic solvent is below 17 (MPa)1/2.