The residual water film on the inner surface of glassware after cleaning should be uniform.

• A. True
• B. False
• C. Not applicable
• D. Sometimes

Answer: (A)

Uniform wetting of the inner surface after cleaning shows the glassware has been thoroughly rinsed and is free of residues that could cause uneven drying or spots. When glass is clean, water spreads evenly as a thin, continuous film because the surface is hydrophilic. This uniform film indicates no pockets of detergent, minerals, or other contaminants remain, which helps ensure consistent drying and prevents localized residues from affecting measurements or cleanliness. If the film were not uniform, droplets or dry patches would suggest incomplete rinsing or contamination in crevices. So the residual water film should be uniform.