Figure 3
From: Direct Reading of Bona Fide Barcode Assays for Diagnostics with Smartphone Apps

Dependence of ODR on concentration of Nanogold streptavidin conjugate following silver enhancement for biotin-streptavidin assays prepared as “−” and “+”
. Scanning by the barcode app is done by placing the PC plate atop a sheet of white paper with the remainder of the barcode printed on it. The different highlighting colors in the plot indicate their feasibility to be scanned by the barcode app: the “−” character can be readily scanned in the green zone, “+”is readable in the pink and neither is read by the app in the gray zone.