When the solid has a high affinity for water - in which case it is called hydrophilic (high energy e.g. glass)- water spreads. In the opposite case of hydrophobic (low energy e.g. teflon) surfaces, water does not spread but, instead, forms at equilibrium a spherical cap resting on the substrate with a 'contact angle'.
Infections such as trichomoniasis, gonorrhea, and Chlamydia (all STDs); and yeast infection can all cause vaginal discharge. Vaginal discharge can be associated with other symptoms such as burning or itching. Antibiotics are given for infections that cause vaginal discharge.
Brown Stringy Discharge: What Can It Be? Generally, brown color of your discharge means the presence of old blood in your vaginal secretions. Fresh blood is bright red, like when you cut your finger. Sometimes a few drops of it mix with vaginal discharge and it becomes pinkish. This color is also reported as normal.