GLAZING AND PAINTING 11.5 



moisture from entering. As a rule, green- 

 houses should be painted one coat both inside 

 and outside every second year, and inside 

 portions which are especially exposed to 

 dampness and shade should be painted every 

 year, care being taken to see that they are 

 perfectly dry when painted. Nothing has 

 yet been found which will excel pure white 

 lead and oil with a turpentine dryer for this 

 purpose.* 



For the outside the intense white may be 

 softened by the addition of a little lampblack 

 or other coloring material, but for the inside, 

 colors are avoided, as they have a ten- 

 dency to absorb light. Pure white is un- 

 doubtedly best for interior painting. 



Greenhouse woodwork when received from 

 the factory has usually been given a priming 

 coat. By special arrangement it is often pos- 

 sible to have it treated in a bath of hot lin- 

 seed oil or creosote. The latter will make it 



*On this point commercial greenhouse builders do not 

 agree. One of the largest firms in the country uses 

 a paint containing 10 per cent, of French zinc and 

 finds it the most satisfactory paint they have ever 

 used. Another well-known firm after experimenting 

 with lead and zinc in varying proportions has gone 

 back to pure lead. The tendency of zinc paints is 

 to crack and peel, and of pure lead paints to become 

 chalky. 



