(Currently Amended) An apparatus suitable for analyzing a treated tape for gas detection, the apparatus comprising: an adjustable color source configured to emit toward a stain on the treated tape that was caused by gas exposure a first radiation at each of a plurality of different target wavelengths in a spectrum; a color sensor configured to: receive first radiation emitted by the adjustable color source, and make a first measurement of the first radiation, wherein the first measurement comprises measurement of the wavelength and intensity of the received first radiation; a photodiode configured to: receive second radiation that is due to reflection of the first radiation from the treated tape, and make a second measurement of the second radiation from the treated tape, wherein the second measurement comprises measurement of the wavelength and intensity of the received second radiation; and a processor configured to: make a comparison of the wavelength measured in the first measurement to the target wavelength, instruct the adjustable color source to adjust the wavelength when the comparison indicates that the measured wavelength is not one of the target wavelengths, determine a peak wavelength corresponding to a wavelength in the plurality of different target wavelengths that has the highest response to stains on the treated tape, and based on the peak wavelength, a color and a darkness associated with the second measurement, determine a type of the gas based on the color, and determine a concentration of the gas based on the darkness. an adjustable color source configured to emit toward a stain on the treated tape that was caused by gas exposure a first radiation at each of a plurality of different target wavelengths in a spectrum; a color sensor configured to: receive first radiation emitted by the adjustable color source, and make a first measurement of the first radiation, wherein the first measurement comprises measurement of the wavelength and intensity of the received first radiation; receive first radiation emitted by the adjustable color source, and make a first measurement of the first radiation, wherein the first measurement comprises measurement of the wavelength and intensity of the received first radiation; a photodiode configured to: receive second radiation that is due to reflection of the first radiation from the treated tape, and make a second measurement of the second radiation from the treated tape, wherein the second measurement comprises measurement of the wavelength and intensity of the received second radiation; and receive second radiation that is due to reflection of the first radiation from the treated tape, and make a second measurement of the second radiation from the treated tape, wherein the second measurement comprises measurement of the wavelength and intensity of the received second radiation; and a processor configured to: make a comparison of the wavelength measured in the first measurement to the target wavelength, instruct the adjustable color source to adjust the wavelength when the comparison indicates that the measured wavelength is not one of the target wavelengths, determine a peak wavelength corresponding to a wavelength in the plurality of different target wavelengths that has the highest response to stains on the treated tape, and based on the peak wavelength, a color and a darkness associated with the second measurement, determine a type of the gas based on the color, and determine a concentration of the gas based on the darkness. make a comparison of the wavelength measured in the first measurement to the target wavelength, instruct the adjustable color source to adjust the wavelength when the comparison indicates that the measured wavelength is not one of the target wavelengths, determine a peak wavelength corresponding to a wavelength in the plurality of different target wavelengths that has the highest response to stains on the treated tape, and based on the peak wavelength, a color and a darkness associated with the second measurement, determine a type of the gas based on the color, and determine a concentration of the gas based on the darkness.