Fresh Sumatra Kratom powder should have a potent aroma. If the powder has a weak or musty smell, it may be old or stale. It should also have a consistent and uniform color. If the powder appears faded or discolored, it may be old or of poor quality. It should have a fine, soft texture that is easy to mix with liquids. If the Sumatra powder feels hard or lumpy, it may be old or have been exposed to moisture.