Phenyldichloroarsine is an odorless, colorless substance that can form hydrochloric acid upon contact with water.

[3] Another product of hydrolysis is phenylarsenious acid, which is a severe irritant to the mucous membranes and skin.

[4] An impure solution of PD also emits a characteristically unpleasant horseradish or garlic-like odor, which is detectable at 0.1 ppm.

[11] PD was developed for use in wet environments, because of its tendency to persist in cool and shaded areas.

[12] Due to PD being easily recognized in the field and a relatively fast rate for decontamination procedures to become effective, the chemical is not as useful as other blister agents.

[4] The blistering resultant from PD exposure may also be delayed, for as little as 30 minutes,[7] or as long as 32 hours depending upon the concentration of the dose.