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International Standards

ISO 12625-7

Introducing ISO 12625-7 - Industrial Physics

ISO 12625-7 is a global ISO testing standard for determining the brightness and color of  tissue paper or tissue products viewed under D65/10° outdoor daylight conditions. 

Brightness was originally defined in the 1930s as a reflectance measurement in the blue part of the visible spectrum defined by TAPPI Test Method T452 to monitor the bleaching cycle. Subsequently, it has been used to characterize paper optical properties outside of just bleaching. 

This ISO brightness testing approach is used to determine the brightness and color of tissue paper and tissue products with specific instructions on how to prepare test pieces as single-ply or multi-ply samples.  

C/2° conditions (indoor daylight) are considered in ISO 12625-15. Although both ISO international standards deal with brightness and color with results obtained usually not correlating. 

ISO 12625-7 testing process 

To perform a successful ISO 12625-7 brightness test you’ll need to illuminate your test sample diffusely using a color spectrophotometer. The light reflected normal to the surface is either allowed to pass through a defined optical filter - and then measured by a photodetector - or measured by an array of photosensitive diodes. Each diode responds to a different effective wavelength.  

The brightness is determined directly from the color spectrophotometer output or by calculation from the photosensitive diode outputs using the appropriate weighting function and color coordinates, calculated for D65/10° testing conditions. 

ISO 12625 testing overview 

ISO 12625-7 is one of several testing approaches defined within the tissue paper and tissue product testing ISO 12625 set of standards. Here is a list of the others: 

ISO 12625-7 brightness testing equipment

So, how can Industrial Physics improve your ISO 12625-7 brightness testing?  

Technidyne ColorTouch®X ISO

An advanced touchscreen color spectrophotometer that measures color difference, brightness, whiteness, opacity and more. The ColorTouch® X ISO uses methods meeting all the most common ISO and TAPPI spectrophotometer standards.  

Technidyne ColorTouch® PC 

The ColorTouch® PC is a powerful color spectrophotometer that gives you complete control over the optical properties of your paper based products. Brought to you by Technidyne, our specialist optical, surface, and physical property testing brand, The ColorTouch® PC inspects everything from ISO brightness, color and color difference to fluorescence and opacity. 

Need ISO 12625-7 brightness testing solutions? Get in touch

We’ve learnt a thing or two about brightness testing over the decades. Now Industrial Physics is recognized as a brand that likes to bring new, innovative color spectrophotometers to market. 

We like to share our knowledge and we’re here to help you to answer your questions about brightness testing. Across the knowledgebase section of our website we publish lots of blogs on related subjects.   

For example, you could try this blog on how brightness and whiteness are related. Then follow up with another blog on tissue paper testing - the technical basics of tissue softness measurement. 

If you have any questions about ISO 12625-7 and how we can help you with your brightness testing, then please just get in touch!

Contact us - Industrial Physics

Your global test and inspection partner for ISO 12625-7