Color family
In the current swatch, Marshmallow reads as purple-mauve rather than rose-brown or beige-brown. The #a781b4 reference gives it a visible cool mauve direction.
Shade reference
Marshmallow is a purple-mauve gloss with more cool mauve presence than the beige-brown and rose-brown Butter Gloss shades.
Color analysis
In the current swatch, Marshmallow reads as purple-mauve rather than rose-brown or beige-brown. The #a781b4 reference gives it a visible cool mauve direction.
Marshmallow leans cool compared with caramel, beige-brown, and rose-brown glosses. It is still softer than the deepest berry-plum shades in the range.
Butter Gloss has translucency, so Marshmallow can soften on the lips. On naturally deeper lips, it may read as a mauve tint unless paired with a deeper liner.
Nearby Butter Gloss shades
Marshmallow is the softer purple-mauve option among the Butter Gloss shades mapped here. Tiramisu is rosier, Angel Food Cake is deeper and berry-mauve, and the brown-leaning shades move away from purple.
Rosier and less purple than Marshmallow.
Deeper and more berry-mauve than Marshmallow.
More muted rose-mauve and less purple than Marshmallow.
Much deeper and more plum-berry than Marshmallow.
Softer rose-brown, while Marshmallow moves more purple-mauve.
More beige-rose and less mauve than Marshmallow.
If Marshmallow feels too soft on its own, use a plum-brown liner for definition. If it feels too purple, a rosy-brown liner can make the gloss feel more grounded.
Lip liner pairings
Marshmallow can lean soft mauve, rosy, or more defined depending on what sits underneath it. Use mauve liner to preserve the cool tone, or use brown liner to ground the gloss.
Keeps Marshmallow in a soft purple-mauve direction without adding too much depth.
Grounds the purple tone and makes the gloss feel more wearable.
Adds definition while staying close to the purple-mauve color family.
These lip liners are at least 10% darker than Marshmallow and ranked by undertone proximity, depth, and saturation.
For more liner context, see Purple Lip Liners, Pink Lip Liners, and Brown Lip Liners.
I would not treat any shade as an exact NYX Butter Gloss Marshmallow dupe without direct swatches. Similar shades should be compared by depth, purple versus rose balance, opacity, and gloss finish.
The closest comparisons will probably come from soft purple-mauve, muted mauve, and cool rosy glosses rather than beige-brown or caramel glosses.
NYX Butter Gloss Marshmallow appears to be a purple-mauve gloss based on the #a781b4 shade reference. It is more purple than Tiramisu and softer than Angel Food Cake.
Marshmallow leans cooler than beige-brown or caramel glosses because of its purple-mauve influence. It is softer than deeper berry-plum shades like Devil's Food Cake.
Marshmallow reads more purple-mauve, while Tiramisu reads rosier and more pink-purple. Depth can shift on the lips because Butter Gloss is translucent.
Marshmallow can work as an everyday gloss if soft mauve and purple tones flatter you. It gives more purple presence than the beige-brown Butter Gloss shades.
Marshmallow can pair with muted mauve liner to preserve the purple tone, rosy-brown liner for structure, or plum-brown liner for more definition.
On deeper skin or naturally deeper lips, Marshmallow may read as a soft purple-mauve gloss. A deeper plum-brown or rosy-brown liner can add definition if the gloss looks too subtle alone.