12 BULLETIN 893, U. S. DEPARTMENT OF AGRICULTURE. 
Tn order to determine the corrosive effect of the gas, several metals 
were cleaned and polished and then exposed to chloropicrin in a fumi- 
gation box, with the following results: 
Concentration ol eassee een eee 0.25 per cent. 1 per cent. 
Pint erOhexpOSURC Sasa eae eee 24 hours. 2 hours. 
Mem Peracuneyjwer eae eee ee ee ee PA OY DS On 
Relative humudity.2.°2 52535 3a 30. 30. 
Metal. Action. Action. 
IESTASS aR een athe dra) eat: HAVE aan Mee eae NonvisiblerefieCts-se— - os sae Very slight corrosion. 
PSHE) le PASO AHH i I ce ls aye | Be Ogee age HOE eekane Se Se eae eaten 0. 
AINE TTL eee eee ee te RR eee GO Eee ee er oa ea mee No visible effect. 
CT TAME eS eda steer a Fe Sah a | COSA espe ue ee ae nie eS Do. 
Galvanized 1ronse se eee Very slight corrosion...........- Do. 
FUNDER RP Ze Sie epee my ENE Sa eS INoivisi blelefiect eee asee see aee Do. 
Of) O) OYE) eo ey Aad ee ra re Very slight corrosion...........- Do. 
PANS EY OS Dees reel ai eM RINNE: eRe eet Bae Ree eel Cea (aN ire HR Ue NOE A el aed Bl A Do. 
Double coats of a number of paints and varnishes were applied to 
2-inch strips of pine and allowed to dry thoroughly, after which they 
were exposed to chloropicrin in the same manner as the metals. 
After fumigation, they were examined with a microscope to detect 
any change in finish, and their color was compared with that of an 
untreated sample. When exposed for 24 hours, at a temperature of 
21°C. and arelative humidity of 30, to a gas of 0.25 per cent concentra- 
tion, or for 2 hours at a temperature of 26° C. and a relative humidity 
_ of 30, to a gas of 1 per cent concentration, no effect was visible in the 
case of the following materials: 
American blue. Lead in oil. 
American vermilion. Raw sienna. 
Burnt sienna. Red lead. 
Burnt umber. Rose pink. 
. Chrome green medium. Valspar varnish. 
Drop black. Wall finish white. 
Lampblack. Yellow ocher. 
The action of chloropicrin on fabrics has been determined by Moore. 
Several varieties of cloth of different colors were exposed to 1 
per cent cyanogen chlorid for 24 hours in a fumigation box. The 
effect on the color was noted, as well as any other injury done. No 
tensile strength tests were made, but the samples were tested by 
pulling the treated and the untreated fabrics and comparing the 
results. The color was not visibly affected, nor could any injury be 
_ detected in the following fabrics after treatment: 
Satin, fancy (malachite green). 
Peau de cygne (tobacco brown). 
Pongee (natural color). 
Surah (gray and white shepherd’s plaid). 
Poplin, silk and wool (white). 
Satin, cotton back (midnight blue). 
Flannel (white). 
Velours (dark brown). 
Poplin, all-wool (black). 
Homespun (brown and white). 
Organdie (rose pink, pale green, light 
blue, and orange). 
Sateen (royal purple, 
cardinal red). 
Voile (flesh pink and lavender). 
Gingham (dull gray blue). 
Gingham, chambray (green) 
Linen, sage green. 
Linen, imitation (Alice blue, pink, and 
coral). 
lemon yellow, 
1 Loc. cit. 
