PAINTS AND VARNISHES 389 



26. To what is black color due? 



27. Why will a paint look differently by gas light and sunlight? 



28. Explain the manufacture of chrome yellow. 



29. What is the basis of yellow paints? 



30. How are light shades produced in yellow paint? 



31. What is red lead? 



32. Why is zinc paint used indoors? 



33. What is an ocher? 



34. What is staining? How does it differ from painting? 



35. What is a filler? Why is it used? 



36. What is the object of graining? Explain how it is done. 



37. What is kalsomining? 



38. What property does " sizing" possess that holds kalsomine 

 to the wall? 



39. Explain sign painting. 



40. Explain gold-leaf lettering. 



41. Explain some of the dangers of the painting trade. What 

 precautions should be used to avoid them? 



