24 



MASS. EXPERIMENT STATION BULLETIN 361 



Table 13. — Amount of Water Soluble Salt Resulting from Exposure of 

 White Paint Pigments on Glass to Fumigation with Burning Sulfur 



Paint Pigment 



Stock Number Pigment 

 (Sherwin-Williams Recovered 

 Company) Grams 



Water Soluble Salt 



Basic Lead Carbonate 18 



Lead sulfate 9 



Titanium Dioxide 1403K 



Titanox B 1097 



(Titanium Dioxide. . . .25%) 



(Barium Sulfate 75%) 



Zinc Oxide 2 



Leaded Zinc 412 



(Zinc Oxide 65%) 



(Lead Sulfate 35%) 



Zinc Sulfide 1538 



Lithopone 416C 



(Zinc Sulfide 28%) 



(Barium Sulfate 72%,) 



3.63 

 3.11 

 2.65 



1.78 



6.97 

 3.82 



2.56 

 2.42 



0.03 

 0.11 

 0.07 

 0.03 



2.95 

 1.21 



0.09 

 0.11 



0.83 

 3.54 

 2.64 

 1.69 



42.32 

 31.68 



3.52 

 4.55 



Table 14. — Effect of Exposure of Paint Pigments in' Oil on Wood to 



Fumigation with Burning Sulfur, and the Action of Extr.\cts of the 



Residue on Plant Foliage 



Paint Pigment 



pH of 

 Extract 



Degree of Injury from Extract 

 Lettuce Tomato 



Basic Lead Carbonate (18) 4.2-4.4 None 



Lead Sulfate (9) 4.8-5.0 Slight 



Titanium Dioxide (1403K) 3.0 or less Slight 



Titanox B (1097) 3.0 or less None 



(Titanium Dioxide. . . .25%) 



(Barium Sulfate 75%) 



Zinc Oxide (2) 6 . 2-6 . 4 Severe 



Leaded Zinc (412) 6.2-6.4 Severe 



(Zinc Oxide 65%) 



(Lead Sulfate 35%) 



Zinc Sulfide (1538) 3.3-3.5 None 



Lithopone (461 C) 3.3-3.5 Slight 



(Zinc Sulfide 28%o) 



(Barium Sulfate 12%) 



Powdered Aluminum 4.6 None 



Aluminum Paint Mixture 4.6-4.8 Slight 



None 

 Slight 

 Slight 

 Trace 



Severe 

 Severe 



None 

 Slight 



None 



None 



In a further experiment the various paint pigments were mixed with linseed 

 oil and painted on wood. After drying, the painted boards were exposed in a 

 humid chamber to fumigation with burning sulfur. After fumigation, the paint 



