But there’s more than meets the eye behind this ketchup quandary—it’s all down to science.
According to scientists on behalf of Heinz—the watery layer is due to physics. Ketchup is a colloid, which means it's a mixture of solid particles (like juicy tomato fibres) suspended in liquid (mainly water and vinegar). Over time, these solids settle, leaving a watery layer on top. The result? The dreaded watery squirt.
“Ketchup is a non-Newtonian fluid, meaning its consistency changes under stress,”explains Dr. Chris Clarke, Food Scientist and Physicist.“When left undisturbed, the particles separate. A good shake redistributes the solids and introduces kinetic energy, preventing that unwanted watery drizzle.”
For those who still forget to shake, we are launching a limited-edition bottle with a blurred keystone label—an artistic nudge to shake before use. Grab yours from Heinz to Home now.
Available until the 29th October.
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Heinz Personalised Christmas 2025 Tomato Ketchup (Plastic) 460g
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Heinz Beanz Of Your Dreamz Bundle 3x390g
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