PURPOSE
To determine a
coloured material’s resistance to oil rubbing in order to secure colour
staining in contact with oily food and liquids.
EQUIPMENT
• Crockmeter
• Cotton
rubbing cloth (5cm x 5cm)
• Light box
with light source D65
• Olive oil, or
similar oil used for cooking384
TEST
SPECIMEN
One specimen for each colour and material. Test shall be
performed both before and after 1 wash
METHOD
1.
Place the test specimen lengthwise into the testing device. If testing a
multi-coloured sample, make sure that the test specimen is positioned in a way
that all colours are rubbed during the test.
2.
Add one drop of oil onto a rubbing cloth and place the rubbing cloth in the
testing device. The warp or weft of the rubbing cloth should be perpendicular
to the test direction.
3.
Rub 10 times in an even pace, approx. 1 cycle per second.
4.
Remove the rubbing cloth and the specimen.
5. Dry the
rubbing cloth before evaluation.
RESULTS
• Place both the rubbing
cloth and the test specimen in light box (D65 light) and
• Place the rubbing cloth
and the test specimen in the light box (D65 light) at an incline plane with an
angle of approx. 45° and evaluate the discolouration.
• Three unstained rubbing
cloths should be placed under the rubbing cloth that is evaluated.
