Why the demonstration liquid is blue
A product ad needs viewers to see what a tampon is supposed to do: take in fluid. Blue liquid makes that action easy to follow on camera. Against a white background, it shows where the fluid lands and whether it is absorbed or left pooling. Menstrual blood would make the demonstration more literal, but it would also make the image harder for advertisers to present as a clean, instantly readable product test.
A visual choice, not a claim about real periods
The blue fluid is a demonstration aid, not a realistic stand-in for menstrual blood. Its color helps separate the test from the bodily experience the product is designed for. That distance fits a long-running advertising convention: show the function of a personal-care product while making the body itself less visible.
The choice also shapes what viewers learn. A blue pour can make absorbency look measurable and tidy, but it cannot show every detail of how a tampon behaves during a period. The ad is demonstrating a product feature, not recreating menstruation.
What the color makes visible
For a few seconds, the blue liquid turns an otherwise difficult-to-film process into a simple visual comparison: fluid goes in, or it does not. That clarity is useful for the commercial—and a reminder that advertising often makes bodily functions legible by changing how they look.
