The drying pattern of paint is affected by its pigment concentration and the drying temperature, with adjustments in these factors offering control over the paint's final appearance. A coffee spill leaves behind a dark stain around the puddle’s edge when it dries. But as drops of paint dry, some
Researchers have found that the pattern of dried paint is influenced by the pigment concentration and the temperature at which it dries. A study in ACS’revealed that drops with lesser pigment or placed on cooler surfaces resembled “fried eggs” when dried, while those with more pigment or dried at higher temperatures appeared more uniform. The findings suggest that by adjusting pigment concentration and drying temperature, one can control the final appearance of dried paint.
A coffee spill leaves behind a dark stain around the puddle’s edge when it dries. But as drops of paint dry, some look like “fried eggs,” with “yolks” of color surrounded by pristine white halos, whereas others appear uniform. To understand this variability, researchers reporting in ACS’literally watched paint dry. They found that pigment concentration and temperature impacted how the liquid gelled and evaporated, information that could help control patterns in dried paint.
As paint drops dry, they can look like a “fried egg” or develop a more even pigment distribution . Credit: Adapted from Langmuir 2023, DOI: 10.1021/acs.langmuir.3c01605 Initially, there were dueling inward and outward flows of the liquid: inward flow from the hot substrate to the cooler top of the droplet, and an outward pull from capillary flow.The final drying step locked the pigments into place on the slide’s surface.
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