Abstract: A device for detecting human body odors produced from ammonia and amino acids—chemicals naturally excreted through the skin and sweat glands. Unless eliminated, such odors can alert game animals to a hunter's presence. Worn on the exterior of odor-absorbing clothing, the device includes both a packet and an indicator chemical sensitive to extremely low concentrations of nitrogen-containing compounds. The packet defines first and second openings which, in use, are directed away from and toward the wearer's body, respectively. Affixed to the packet, a transparent tape forms an airtight window through which one can continually view the indicator chemical, held in place within the first opening by the tape's adhesive backing. Accessible only to substances which pass through the wearer's clothing and then into the packet's interior via the second opening, the indicator chemical undergoes a permanent color change, once odor-producing chemicals begin to break through the clothing.

Abstract: This invention relates to a device to detect human body odors, The human body naturally emits an odors which is a combination of ammonia and amino acids. Hunters can be detected by game animals from these odors. To avoid detection hunters can wear special clothing that have means for masking the body odor. However during use. these masking chemicals lose their effect and the human odor has a breakthrough. It is desirable for the hunters to know when this break-through has occurred so they can recharge the masking chemicals or change their clothing. This invention discloses a device that gives a very sensitive, quick-acting permanent indication of this odor break-through.