Hydrogenography is a combinatorial method based on the observation of optical changes on the metal surface by hydrogen absorption.^[1] The method allows the examination of thousands of combinations of alloy samples in a single batch.

In the 1996 report of the method, thin films were coated with yttrium and lanthanum topped with a layer of palladium for the diffusion of hydrogen. The rate of absorption of hydrogen resulted in typical optical properties.^[2] In the 2008 report magnesium, titanium and nickel are eroded and sputtering deposited in different ratios onto a transparent film in a thin layer of 100 nanometres following exposure to hydrogen in different amounts resulting in optical differences.^[3]

• Hydrogen embrittlement
• Hydrogen storage

• Hydrogenography: An optical combinatorial method to find new light-weight hydrogen-storage materials