Abstract: A thermal marker, according to various embodiment, can include a marker detectable by thermal sensors but having additional properties. The thermal marker can be developed in a panoply of colors or can be created to have retroreflective properties. In various embodiments, a single marker can be produced that is detectable by multiple thermal imaging sensor systems. In various embodiments, the markers can be simultaneously used with the naked eye and various sensors. Additionally, a method according to various embodiments can produce a thermal marker in a wide variety of colors. The thermal markers can covertly mark objects, such as vehicles, people, and other fixed assets efficiently to assist in surveillance missions.