The source uses white coffee to discuss unusually lightly roasted beans. In that context, white describes a much paler appearance than a conventional darker roast, not a bean that is literally white or necessarily a drink containing milk. A useful comparison begins by asking the seller exactly what product and process the name identifies.
Look for the coffee's origin, roast information and preparation guidance. Very light-roasted material may require a different approach from a familiar supermarket roast, so check suitability for your grinder and brewing equipment rather than assuming that every device will handle it in the same way. Descriptions such as nutty or grassy are sensory impressions, not a complete specification.
Claims about substantially more caffeine or better health need evidence for the actual product. Roast color alone cannot supply those answers, and a secretive marketing description makes a comparison harder rather than more impressive. Decide whether the flavor and preparation suit you after obtaining clear information. The name is a reason to ask questions, not a substitute for them.
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A good question can make a better brew.