Investigation of optimal conditions needed for the production of indigo and subsequent dyeing using CO2/O2 sensors and a cellphone camera

An investigation of the process involved in the production of and dyeing with indigo based on a CO 2 /O 2 sensor device and a cellphone-camera is reported. The former involves transforming indican to indigo, and the latter the process by which indigo and indigo-white are produced. During the process of indigo production, a clear and positive correlation can be observed between the concentration of gas levels (either the production of CO 2 or the consumption of O 2 ) and the final yield. The authors found that for the first time that the change in the concentration levels of CO 2 /O 2 can be used as important parameters for indigo dyeing. The optimal time required to produce indigo can be decided by the change of CO 2 /O 2 concentration level. It is no long should depending on the experience of a craftsperson. Furthermore, the optimal time needed to produce indigo also can be decided by the concentration levels of glucose. The color analysis of indigo dyeing can be performed by using a camera and by calculating the RGB and HSV (hue, saturation, value) values. Graphical abstract