ISO 12625-15:2015
Tissue paper and tissue products — Part 15: Determination of optical properties — Measurement of brightness and colour with C/2° (indoor daylight) illuminant
ISO 12625-15:2015 specifies testing procedures for the instrumental determination of brightness and colour of tissue paper and tissue products viewed in indoor daylight conditions. It also gives specific instructions for the preparation of test pieces (single-ply, multi-ply products) and for the optical measurements of products, where special precautions may be necessary.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
5.1 Reflectometer or spectrophotometer
5.2 Reference standard for calibration of the instrument
5.3 Working standards
6 Calibration
7 Sampling
8 Conditioning
9 Preparation of test pieces
10 Procedure
10.1 General
10.2 Measurement of C/2° brightness
10.3 Measurement of (C/2°) colour
11 Calculation
11.1 C/2° brightness
11.2 C/2° Colour
11.2.1 Single values
11.2.2 Mean value
11.2.3 Dispersion of the results
12 Test report
Annex A (informative) Precision
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
5.1 Reflectometer or spectrophotometer
5.2 Reference standard for calibration of the instrument
5.3 Working standards
6 Calibration
7 Sampling
8 Conditioning
9 Preparation of test pieces
10 Procedure
10.1 General
10.2 Measurement of C/2° brightness
10.3 Measurement of (C/2°) colour
11 Calculation
11.1 C/2° brightness
11.2 C/2° Colour
11.2.1 Single values
11.2.2 Mean value
11.2.3 Dispersion of the results
12 Test report
Annex A (informative) Precision
Bibliography