单选题 What is a pigment?
  • A. A chemical used for cleaning painting equipment
  • B. A cover to protect paintings from the effects of sunlight
  • C. A substance that gives its color to another material
  • D. A synthetic fabric that is suitable for painting on
【正确答案】 C
【答案解析】[解析] 1-5 Whether you're working with oil, tempera, or watercolor, it's the pigment that gives the paint its color. A pigment can either be mixed with another material or applied over its surface in a thin layer. When a pigment is mixed or ground in a liquid vehicle to form paint, it does not dissolve but remains suspended in the liquid. A paint pigment should be a smooth, finely divided powder. It should withstand the action of sunlight without changing color. A pigment should not exert a harmful chemical reaction upon the medium, or upon other color pigments it is mixed with. Generally, pigments are classified according to their origin, either natural or synthetic. Natural inorganic pigments, also known as mineral pigments, include the native "earths" such as ochre--yellow iron oxide--and raw umber--brown iron oxide. Natural organic pigments come from vegetable and animal sources. Some examples are indigo, from the indigo plant, and Tyrian purple, the imperial purple the Romans prepared from a shellfish native to the Mediterranean. Today, many pigments are synthetic varieties of traditional inorganic and organic pigments. Synthetic organic pigments provide colors of unmatched intensity and tinting strength. The synthetic counterparts of the yellow and red earths are more brilliant and, if well prepared, are superior in all other respects to the native products. Inorganic synthetic colors made with the aid of strong heat are generally the most permanent for all uses. In contrast, pigments from natural sources are less permanent than the average synthetic color. 1. What is a pigment? The instructor says: ...it's the pigment that gives the paint its color
单选题 According to the instructor, what characteristic should a pigment have?
  • A. Ability to be applied at any temperature
  • B. Ability to dry quickly after application
  • C. No loss of strength when dissolved
  • D. No harmful reaction with other pigments
【正确答案】 D
【答案解析】[解析] According to the instructor, what characteristic should a pigment have? The instructor says: A pigment should not exert a harmful chemical reaction upon the medtum, or upon other color pigments it is mixed with.
单选题 How are pigments generally classified?
  • A. By origin
  • B. By texture
  • C. By color
  • D. By quality
【正确答案】 A
【答案解析】[解析] How are pigments generally classified? The instructor says: Generally, pigments are classified according to their origin, either natural or synthetic.
单选题 Which natural pigment did the Romans obtain from a shellfish?
  • A. Raw umber
  • B. Indigo
  • C. Tyrian purple
  • D. Ochre
【正确答案】 C
【答案解析】[解析] Which natural pigment did the Romans obtain from a shellfish? The instructor says: ... Tyrian purple, the imperial purple the Romans prepared from a shellfish native to the Mediterranean.
多选题 According to the instructor, why are synthetic pigments superior to natural pigments? Click on 2 answers. They last for a longer time. They have a smoother surface. They are less expensive.
【正确答案】 A、D
【答案解析】[解析] According to the instructor, why are synthetic pigments superior to natural pigments? Synthetic pigments are superior because they last for a longer time: Inorganic synthetic colors.., are generally the most permanent for all uses. In contrast, pigments from natural sources are less permanent than the average synthetic color. They also provide stronger, brighter colors: Synthetic organic pigments provide colors of unmatched intensity and tinting strength. The synthetic counterparts of the yellow and red earths are more brilliant and...are superior in all other respects to the native products.