What is the function of a Mahl stick in painting?

A Mahl stick is a traditional tool used by painters to provide stability while they work on their artwork, particularly when creating fine details or working on the canvas for extended periods. It is essentially a long stick, often with a padded end, that painters rest against the canvas to support their painting arm. This stabilization helps in minimizing unintentional movement or shaking, allowing for greater control and precision in brushwork.

The other options focus on different functionalities that do not align with the specific purpose of a Mahl stick. For instance, while carrying supplies is essential for painters, it does not relate to the direct action of painting and ensuring steadiness. Similarly, restoring old paint or mixing different colors addresses entirely different processes within art creation that do not involve the use of a Mahl stick. The primary role of the Mahl stick as a stabilizing tool underscores its importance in the painting process for achieving fine detail and maintaining accuracy.