(I) One main challenge in the production of readymixed paints was the achievement of complete dispersion of the pigment in the vehicle. (II) All the early patent paints had a poor reputation because they were thin and lacked opacity. (III) The widespread use of lime and calcium carbonate instead of the more expensive white lead produced paint that streaked. (IV) Some manufacturers diluted their paints with too much water. (V) Others added crushed pebbles to make the cans heavier.