Colour card developed by Akvo
Printing: The card is printed on non-reflective card paper with a matte finish for the ink as well
QR Code: The card double up as a QR code that not only helps with focussing the camera, but also encodes the version of the card
Card Version: The card version is printed on the lower left position element of the QR code. In the picture above, the version is 2.
Colour Swatches: A series of colour swatches are provided in a 13 x 5 grid on the card. These colours are chosen from across the spectrum and shades of grey.
Strip Backdrop: A large, black area is provided at the bottom of the colour reader to place the strip for reading
Strip Positioning Marks: Vertical stripes indicate in which direction the strip should be placed. In the case of pH, the strip must be placed so that the coloured surface is towards the vertical line, as shown in the image below.
[TODO strip in card]