ABSORPTION" AND PENETRATION OF COAL TAR AND CREOSOTE. 27 
Specific gravity, 1.0576 at 60° C. The index of refraction values and the distillation 
curve indicate that the oil is a pure coal-tar creosote. 
Creosote No. 4. — The distillation is as follows: 
Temperature. 
Distillation 
°C. 
205 
Per cent. 
1.2 
22.7 
5.7 
9.9 
11.5 
27.6 
20.9 
0.5 
235 
245 
275 
305 
360 
Residue 
Loss 
Total 
100.0 
Specific gravity, 1.071 at 60° C. The indices of refraction at 60° C. are very low 
for a pure coal-tar creosote. The sulphonation values are low, yet are an indication 
of the presence of petroleum oils. The residue is a soft sticky pitch and indicates 
the presence of undistilled tar probably less than 5 per cent. From the appearance 
and physical properties of the fractions the creosote behaves very much like a mixed 
creosote. 
Creosote No. 5. — The distillation is as follows: 
Temperature. 
Distillation. 
°C. 
205 
Per cent. 
1.3 
2.2 
1.8 
7.1 
14.2 
40.4 
32.8 
0.2 
235 
245 
275 
305 
360 
Residue 
Loss 
Total 
100.0 
