STAIN - GB/T18102-2007 (6.3.14) and GB/T17657-1999 (4.37) (adapted)

1. TOOLS
1.1 Cover, about∮40 mm
1.2 Dripping-bottle, 30 ml or 60 ml
1.3 Absorbent cotton
1.4 Water or solvent (alcohol, acetone)
1.5 Testing substance (nail polish, red ink, vinegar, lipstick, soy sauce, red wine, etc.)

2. SAMPLING
11*50x50 mm

3. TESTING PROCEDURE
3.1 Clean the samples surface with absorbent cotton



3.2 Smear minimum 2 drops of testing substance (red ink, vinegar, lipstick, wine with color, etc.) over 300 mm2



3.3 Cover the testing substance for 24 hours



3.4 Swab the surface with water or solvent and dry with absorbent cotton



3.5 Observe the surface from 40 mm away

4. ASSESSING TEST RESULTS
Passing requirement: no stain, no corrosion