Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) The RGB values converted from the reflectance spectrum of sensor strips variation versus the logarithmic concentration of Cu2+. (b) Color-differentiation map comprising the converted RGB colors versus a series of Cu2+ concentrations. Reprinted with permission from [28]. © 2011 Royal Society of Chemistry.
