Color Fastness to Saliva Test

Determine the resistance of the colour of textiles regarding influence of saliva. This test must be done for fabrics used for baby / infant garments only.

Apparatus required:

• Filter paper
• Stick tape
• Distilled water
• Desiccator with water
• Drying cabinet with a constant temperature of 40°C +/- 2°C.
• Solution 1 and 2

Solution 1:

• 4.2 g/l Sodium hydrogen carbonate
• 0.5 g/l Sodium chloride
• 0.2 g/l Potassium carbonate

Solution 2:

• 4.5 g/l Sodium chloride
• 0.3 g/l Potassium chloride
• 0.3 g/l Sodium sulphate
• 0.4 g/l Ammonium chloride
• 3.0 g/l DL-Lactic acid (~90%)
• 0.2 g/l Urea

Procedure:

1. Desiccator filled with water (app. 5cm) preheated at 40 degree
2. Cut one sample of 90 x 120 mm out of the testing fabric
3. Cut two stripes 15 x 80 mm of filter paper
4. Dip one of the filter paper in solution 1 and the other in solution 2
5. Put the soaked stripes of filter paper on the tested fabric with a distance of 10 mm between both filter papers
6. Put the stick tape over the testing sample with filter paper
7. Put the prepared sample for 2 hours at 40 degree into the desiccator

Evaluation:

After carry out the time, take off the filter paper from test fabric and evaluate the colour staining.

Fast to saliva = No colour staining

Non fast to saliva = colour staining