# What is a cryptometer and how does it work?

Jessica Washington · August 23, 2026

> A cryptometer is a specialized instrument used to measure the opacity or "hiding power" of paints, pigments, and coatings. It helps determine how...

A cryptometer is a specialized instrument used to measure the opacity or "hiding power" of paints, pigments, and coatings.

It helps determine how effectively a material can cover or conceal an underlying surface.

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Cryptometers work by measuring the amount of light reflected from a painted surface compared to a standard reference.

This reflectance value is then used to calculate the opacity of the paint.

The ASTM (American Society for Testing and Materials) has established standard test methods, such as ASTM D2805, that define the proper procedures for using a cryptometer to evaluate paint opacity.

Modern digital cryptometers automate many of the measurement processes, providing rapid and precise opacity readings.

They often include features like automatic calibration and data integration with computer systems.

Cryptometers are essential tools for paint manufacturers, formulators, and quality control professionals to ensure their products meet desired opacity specifications and performance standards.

Beyond paints, cryptometers can also be used to measure the opacity of other coatings, films, or translucent materials like plastics, inks, and textiles.

The opacity measurement provided by a cryptometer is expressed as a percentage, with 0% being completely transparent and 100% being completely opaque.

Factors that influence a paint's opacity include the type and concentration of pigments, the vehicle (binder) used, and the application thickness of the coating.

Cryptometers typically use a white backing or "hiding chart" as a reference to measure the reflectance of the test sample compared to a fully opaque surface.

Some advanced cryptometers can also measure other paint properties like color, gloss, and sheen to provide a comprehensive evaluation of the coating's performance.

The development of new pigments and paint formulations has driven the need for more sophisticated cryptometers capable of handling a wider range of materials and measuring additional parameters.

While the term "cryptometer" is not widely used outside the paint and coatings industry, the basic principles of opacity measurement are applicable to various fields where the transparency or coverage of materials is important.

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