Fluorescence Observation of Coffee Beans

Since the release of the fluorescence module for the smartphone macro microscope, the range of everyday objects that can be examined with fluorescence has expanded significantly. Fluorescence observation is no longer just an optional feature found on microscopes—it has become a scientific tool that can be used anytime and anywhere. After seeing a community member share fluorescence images of raw coffee beans, I became curious whether roasted beans would also show fluorescence. So, I picked up a few and took a closer look.

Coffee Bean Information

Coffee Bean: Ethiopia Chechere

Processing Method: Washed / Very Light Roast

Variety: Heirloom (Landrace)

Observation Photos

No filter used, shot with smartphone macro lens only.

Shot with orange filter, smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery).

Shot with orange filter, smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery).

Shot with orange filter, smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery).

Shot with orange filter + blue fluorescence light (light source: 2 blue-green filters, one battery).

Shot with orange filter + blue fluorescence light (light source: 2 blue-green filters, one battery).

No orange filter, shot directly with blue fluorescence light (light source: 2 blue-green filters, one battery).

Shot with orange filter + blue fluorescence light (light source: 2 blue-green filters, one battery).

No filter used, shot with smartphone macro lens only. The inner membrane of the coffee bean shows strong fluorescence.

Shot with orange filter, smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery). Fluorescence light positioned very close to the coffee bean.

Shot with orange filter, smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery). Fluorescence light positioned very close to the coffee bean.

Shot with orange filter, smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery). Fluorescence light positioned very close to the coffee bean.

Shot with orange filter, smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery). Fluorescence light positioned very close to the coffee bean.

Shot with orange filter, smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery). Fluorescence light positioned very close to the coffee bean, exposure value set to -2.0.

No filter used, shot with smartphone macro lens + blue fluorescence light (light source: 2 blue-green filters, one battery). Fluorescence light positioned very close to the coffee bean, exposure value set to -2.0.