A container is disclosed which may be used with fluids sensitive to light of one or more known wavelengths. The container may be formed of a thermochromic material or including a thermochromic coating. The properties of the thermochromic material or coating may be selected so as to be transparent to light of the wavelength to which the fluid is sensitive at a first temperature and to be opaque to that wavelength of light at a second temperature. While a technician is handling the container, the container is controlled to be at the first temperature. When the technician is finished, the container is controlled to move to the second temperature to protect the fluid within the container.