STRUCTURAL PAINT TESTS 241 



of these pigments when mixed with oil. It is assumed that they 

 have the property of keeping the oil in a semi-drying condition, 

 which will not disintegrate as early as when the oil is thoroughly 

 dried to linoxyn. If this is true, it would seem advisable to use 

 with hard-drying pigments, a proportion of some oil that is semi- 



Corroded and Pitted Surface of Plate Painted with Stimulative 



Paint 



drying in nature or one which will leave a film not too hard. 

 Soya bean oil, wood oil, and fish oil present themselves as can- 

 didates for such use. How they will work in practice, however, 

 is a question not yet determined. On the other hand, it is well 

 known that these pigments require enormous quantities of oil 

 in order to grind to a working consistency, and it is possible that 



