1A — A. pullulans on organotin Resin 1. 

 IB — A. pullulans on original Resin 1. 

 2A — A. oryzae on organotin Resin 2. 

 2B — A. oryzae on original Resin 2. 

 3A — A. niger on organotin Resin 3. 

 3B — A. niger on original Resin 3. 



Figure 3. Test specimens after 14 days of incubation. 



Tables 3 and 4 list results of growth resistance tests on unpig- 

 mented and pigmented resins, respectively. Table 5 presents the formula- 

 tion of the pigmented resins. In all cases, the average resistance to 

 fungal growth was greater with the reacted resin containing tin than the 

 corresponding original resin (see Figure 3). Also, rating totals general- 

 ly increased with increasing acid values for the four vegetable oil 

 alkyds (Resins 1 through 4), both for the original and the organotin 

 resins. This was also true for the fish oil alkyd (Resin 5) in the test 

 with pigmented resins. This may be related to the fact that the resins 

 with higher acid numbers had lower oil contents (shorter oil lengths); 

 thus, their films had less nutrient for the fungi and were harder. 

 Softer films are reported [1] to be more susceptible to fungal attack. 



