Final answer:
The primary function of fillers in paints is to add toughness, texture, and special properties, or to reduce costs, and not to lift and deposit color in a single process.
Step-by-step explanation:
Fillers in paints provide various benefits, but they do not have the capability to lift and deposit color in a single process. This is because the primary purpose of fillers is to impart toughness, texture, and to give the paint special properties or to reduce costs. They are granular solids, unlike pigments, which provide color, and dyes, which dissolve in the paint to achieve the same. During the manufacturing process, the particle size of these fillers can be measured using a Hegman gauge, ensuring the consistency and quality of the paint.