How a white pigment hides a tablet’s color
A tablet is a mixture, not a solid lump of medicine. Its active drug is combined with other ingredients that help the powder hold together, dissolve, or pass through manufacturing equipment. Those ingredients—and sometimes the drug itself—can give the blend a grayish or uneven color.
Titanium dioxide can make that color disappear beneath a bright white surface. It is an opaque pigment: rather than letting light pass through, its particles scatter visible light in many directions. In a tablet coating or the tablet material itself, that scattering masks the darker colors underneath, much as white paint covers a stained wall.
Appearance is separate from the dose
The pigment changes how the tablet looks, not what the medicine is meant to do. It does not supply the active drug or make that drug stronger. A manufacturer may use it to produce a more uniform-looking tablet even when the ingredients naturally vary in shade.
Not every pill is white, and not every white pill gets its color in exactly the same way. But when titanium dioxide is used, the familiar whiteness is an optical effect: light is being scattered by the pigment, rather than the medicine itself being naturally white.
