Which of the following statements about alginate impressions is NOT true?

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It must be removed quickly from the oral cavityIt can show fluid on its surface due to absorbing waterIt absorbs moisture and swells if stored wetIt undergoes shrinkage because of syneresisIt sets through a chemical reaction involving calcium ions

Explanation

Alginate impressions should be removed promptly from the mouth to prevent distortion. They absorb water and swell if kept moist, and they shrink due to syneresis when drying. However, fluid appearing on the surface from water absorption (imbibition) is not a typical characteristic, making option B incorrect.