Scope 2 Normative reference documents 3 Terms and definitions 3.1 Pore tightening 3.2 Pore area ratio 3.3 Skin smoothness 4 Basic principles 5 Selection of subjects 5.1 Number of subjects 5.2 Inclusion criteria 5.3 Exclusion criteria 5.4 Subject restrictions 6 Test method 6.1 Test object 6.2 Test site 6.3 Instruments and equipment 6.4 Test conditions 6.5 Test process 7 Data statistics 8 Result calculation 9 Result evaluation 10 Test report