D+Caf Caffeine Test Strips: A Handy Tool for Caffeine Detection

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Silver Lake Research Company has introduced D+Caf Caffeine Test Strips, a product promising to quickly discern whether a beverage is caffeinated or decaffeinated. Priced at $9.95 for a tube containing 20 strips, this innovation aims to assist caffeine-sensitive individuals and the curious ones in accurately labeling their coffee as regular or decaf.

The Promise and the Practice

D+Caf test strips claim to be user-friendly, providing swift and reliable results with an accuracy rate comparable to professional laboratories (98+% accuracy). However, the practical application of these strips is not as broad as one might hope. They are not designed to work on beverages mixed with milk or sugar, limiting their use to black coffees and unsweetened teas.

Caffeine Levels and FDA Regulations

The caffeine content in regular coffee can vary widely, ranging from 75 to 150 milligrams per cup, depending on the bean variety. The FDA mandates that for a drink to be labeled as decaf, 97.5% of the caffeine in coffee beans must be removed. However, it does not specify the permissible amount of residual caffeine, leading to variations in caffeine content in decaffeinated beverages. D+Caf strips categorize a 6-ounce drink with up to 20 mg of caffeine as “decaf” and anything over 20 mg as caffeinated.

Testing and Results

The testing process is straightforward: immerse 1/8 inch of the strip into the beverage and await results for 30 seconds. However, interpreting the results can be challenging. The strips generally align with the labels on the coffee or tea, but discrepancies were noted, particularly with Pure Green tea, which was indicated as “decaf” despite having 21.2 milligrams of caffeine according to the company website. This inconsistency is attributed to the organic production method of the tea, allowing each brew to have varying levels of caffeine.

Utility and Limitations

D+Caf strips are a convenient tool for those concerned about accidental caffeine intake, especially when doubting the accuracy of beverage labels in restaurants. However, for those seeking to monitor subtle variations in caffeine content or exact intake levels, the strips may fall short due to their imprecise results.


D+Caf Caffeine Test Strips by Silver Lake Research Company offer a novel solution for detecting the presence of caffeine in beverages, catering to the needs of caffeine-sensitive and curious consumers. While the product holds promise with its easy-to-use feature and quick results, its limitations in detecting precise caffeine levels and its inability to work with sweetened or milk-based beverages may restrict its applicability. Nonetheless, it remains a useful product for those seeking a quick verification of their drink’s caffeine content.