A guideline to haze and how to measure it

Haze - what exactly does it mean? Get an insight into this phenomenon and realize its meaning, why and how it is measured and learn more about specific applications turbidity analysis is relevant for.

A short Introduction to Haze

Haze, also called turbidity, is not a well-defined physical attribute like temperature or the density of a liquid, but is always expressed with reference to a well-defined standard. Turbidity or Haze is defined in the DIN EN 27027 standard as follows:

"Turbidity is the decrease in the transparency of a liquid caused by the presence of undissolved substances." 

What is Haze?

Haze and Turbidity - different words, same meaning

Haze - or turbidity - is the cloudiness of a liquid caused by small solid particles that are generally invisible to the naked eye, similar to smoke in air.

Haze and Color - different words, different meaning

Haze has nothing to do with color. When looking at a written text through two glasses of apple juice, the clear juice on the left in Figure 2 allows easy reading of the letters. The juice to the right is turbid, the text will appear blurred. Both liquids are yellow: the color is the same, the turbidity is different. The more turbid the juice, the harder it gets to read the letters.

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