These are commercial casein-base paints or dry pigments mixed with glue and water. The base color is put on. Good scene painting is judged by how it looks to the audience, not how it looks at close range. They may be made especially for the play, taken from the theatre storeroom, or borrowed from stores or homes. A prop must be in scale with the setting.
Every theatre gathers a store of props from secondhand stores or from home castoffs.
Borrowed props must be handled carefully and returned to the lender as soon as the show closes. Traditionally the property master also sweeps the stage and handles the sound effects. Today, with so many sound effects on audio media, this job is often done by the lighting crew. In general it is better to use to little make-up than too much. The audience audience should not be aware that the actor's face is painted.