The Milkmaid (Vermeer) van Leyden's engraving "The Milkmaid" (1510) and Jacques de Gheyn II's engraving "The Archer and the Milkmaid" (about 1610). Vermeer's painting is even more understated, although the use of symbols remains: one of the Delft tiles at the foot of the wall behind the maid, near the foot warmer, depicts Cupid – which can imply arousal of a woman or simply that while she is working she is daydreaming about a man. Other amorous symbols in the painting include a wide-mouthed jug, often used as a symbol of the female anatomy. The foot warmer was often used by artists as
Produced water oil to the production wells. The injected water eventually reaches the production wells, and so in the later stages of waterflooding, the produced water proportion ("cut") of the total production increases. The water composition ranges widely from well to well and even over the life of the same well. Much produced water is brine, and most formations result in total dissolved solids too high for beneficial reuse. All produced water contains oil and suspended solids. Some produced water contains heavy metals and traces of naturally occurring radioactive material (NORM), which over time deposits radioactive scale in the piping at the