Mustard agent was dispersed as an aerosol in a mixture with other chemicals, giving it a yellow-brown color and a distinctive odor. Mustard agent has also been dispersed in such munitions as aerial bombs, land mines, mortar rounds, artillery shells, and rockets. Exposure to mustard agent was lethal in about 1% of cases. Its effectiveness was as an incapacitating agent. The early countermeasures against mustard agent were relatively ineffective, since a soldier wearing a gas mask was not protected against absorbing it through his skin and being blistered. The effectiveness of using a urine-soaked mask or facecloth to prevent or reduce injury, a common anecdotal field-expedient remedy attested by soldiers in documentaries e.g. They Shall Not Grow Old in 2018 and others (such as forward aid nurses) interviewed between 1947 and 1981 by the British Broadcasting Corporation for various World War One history programs on being gassed remains unclear.