A method and a system for determining a property of at least one liquid

A method for determining a property of at least one liquid, the method comprising

• providing at least a first liquid and a second liquid wherein at least one component of the first and/or the second liquid comprises a detectable marker;
• feeding liquid into a channel comprising feeding a portion of said first liquid and a portion of the second liquid in succession into a channel to provide an interfacial contact between said first liquid portion and said second liquid portion;
• obtaining a row of signals by reading out intensity of said marker of a plurality of volume fractions of said first liquid portion and said second liquid portion located at an interface region comprising said interface between said first liquid portion and said second liquid portion and
• determining said property of the at least one of the first liquid and the second liquid from said signal row,
• wherein said determination is based on signal perturbations or lack of signal perturbations of the row of signals obtained at the interface region, and
• wherein the reading out is performed after a contacting time Tc from establishing said interfacial contact between said first liquid portion and said second liquid portion.