Dryness in the mouth can also be due to a change in the composition of saliva or reduced salivary flow in the mouth. Medically, dry mouth is also known as xerostomia. There are a few home remedies to prevent dry mouth. These dry mouth home remedies need to be used on a daily basis to help ward off the problem. Pregnant women and the elderly too face dry mouth along with bad breath. This too can be treated with the home remedies. Take a look.
If you heat the glass uniformly and quench the glass uniformly, you have no iridescence. However, that is only theoretical with heat-treated tempered glass. People tend to think that iridescence is caused only by the quench. Surprisingly, the worst iridescence examples usually are caused in the heating section.
In paints it is caused by similar shiny smooth particles as pearlescent effects, only the particles have more than one reflective surface, and so the color of the paint changes depending on the angle of viewing. This is very popular in custom car paint jobs.