Close-up of colorful powdered pigments used as natural textile dye, Pisac market, Pisac, Sacred Valley, Urubamba Province, Cusco (Cuzco) Region, Peru, South America

Brown balls of wool and dried leaves as natural dye, Chinchero, Sacred Valley, Urubamba Province, Cusco (Cuzco) Region, Peru, South America

Red balls of wool and cactus insects as natural dye, Chinchero, Sacred Valley, Urubamba Province, Cusco (Cuzco) Region, Peru, South America

PHD scientist Ian Bartholomew using dye tracing techniques as part of a study to measure the speed of the Russell Glacier near Kangerlussuaq, Greenland, Polar Regions

PHD scientist Ian Bartholomew using dye tracing techniques as part of a study to measure the speed of the Russell Glacier near Kangerlussuaq, Greenland, Polar Regions

PHD scientist Ian Bartholomew using dye tracing techniques as part of a study to measure the speed of the Russell Glacier near Kangerlussuaq, Greenland, Polar Regions

PHD scientist Ian Bartholomew using dye tracing techniques as part of a study to measure the speed of the Russell Glacier near Kangerlussuaq, Greenland, Polar Regions

PHD scientist Ian Bartholomew using dye tracing techniques as part of a study to measure the speed of the Russell Glacier near Kangerlussuaq, Greenland, Polar Regions