Tell us about yourself!
RaviP6, How far have you gotten towards that? Do you have an image like the top part? If so, I think you can use ImageJ (which you can download free) to get the bottom half from the top half.
Russ_hensel: a colorless solution passes all colors through. A pink solution passes red through, but blocks a bit of the non-red colors. It's the non-red colors that are changing when the indicator changes. If you use a red filter, and therefore are only looking at red, you will see little or no change when the indicator changes colors. A ~550 nm filter should improve the signal to noise ratio somewhat, though.
Infinity LED mirror
Pipe table lamp with cement base