Page:Violin Varnish and How to Make it.djvu/22

12 is that while it will mark a piece of paper in a greasy fashion, the mark is not permanent, but will in a certain time entirely disappear, and, under the influence of heat, disappear more rapidly.

They have the property, as have certain other oils, of becoming solidified and leaving a deposit of rosin.

Technically, there are many varieties of these oils, which are all duly classified, but for our purpose we can divide them into two broad classes–those that remain liquid and those that can be solidified in the form of crystals.

They are hardly soluble in water, though they impart to it its odour.