diff --git a/crates/ui-egui/src/panels.rs b/crates/ui-egui/src/panels.rs
index 7feed8f95..6015dbaa6 100644
--- a/crates/ui-egui/src/panels.rs
+++ b/crates/ui-egui/src/panels.rs
@@ -236,13 +236,18 @@ pub fn panel_menu_items(app: &mut VectorcraftApp, ui: &mut Ui, id: &str) -> bool
     true
 }
 
-/// The ≡ panel-menu button drawn into `rect` (the right end of a panel's title/tab strip).
-pub fn panel_menu(app: &mut VectorcraftApp, ui: &mut Ui, id: &str, rect: Rect) {
+/// The ≡ button drawn into `rect` that opens a panel menu.
+fn menu_button(ui: &mut Ui, id: &str, rect: Rect) -> egui::Response {
     let t = Tokens::get(ui.ctx());
     let resp = ui.interact(rect, ui.scope_id().with(("panel-menu", id)), Sense::click());
     icons::paint(ui, "menu", rect.shrink(1.0), if resp.hovered() { t.text_strong } else { t.text_dim });
     resp.widget_info(|| egui::WidgetInfo::labeled(egui::Role::Button, ui.is_enabled(), tl!("Panel menu")));
-    let resp = resp.on_hover_text(tl!("Panel menu"));
+    resp.on_hover_text(tl!("Panel menu"))
+}
+
+/// The ≡ panel-menu button drawn into `rect` (the right end of a panel's title/tab strip).
+pub fn panel_menu(app: &mut VectorcraftApp, ui: &mut Ui, id: &str, rect: Rect) {
+    let resp = menu_button(ui, id, rect);
     egui::Popup::menu(&resp).show(|ui| {
         crate::widgets::menu_scroll(ui, |ui| {
             ui.set_min_width(220.0);
@@ -431,6 +436,18 @@ fn paint_popover(app: &mut VectorcraftApp, ui: &mut Ui) {
                 set_pstate(ui.ctx(), MIXER, m);
             }
         }
+        // The mixer is the Color panel, so its menu comes along: the color modes (Grayscale,
+        // RGB, HSB, CMYK, Web Safe RGB), Invert, Complement and the rest (#4249).
+        if mixer {
+            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                let (rect, _) = ui.allocate_exact_size(vec2(18.0, 18.0), Sense::hover());
+                let resp = menu_button(ui, "color-mixer", rect);
+                egui::Popup::menu(&resp).show(|ui| {
+                    ui.set_min_width(200.0);
+                    color::menu(app, ui);
+                });
+            });
+        }
     });
     crate::widgets::divider(ui);
     if mixer {
diff --git a/crates/ui-egui/src/tests/paintchips.rs b/crates/ui-egui/src/tests/paintchips.rs
index ba5730238..5ede05407 100644
--- a/crates/ui-egui/src/tests/paintchips.rs
+++ b/crates/ui-egui/src/tests/paintchips.rs
@@ -322,3 +322,31 @@ fn the_popover_swatch_libraries_button_opens_the_libraries_menu() {
     let open = crate::panels::library_panel::last_open(&app.ui).map(|o| (o.kind.clone(), o.id.clone()));
     assert_eq!(open, Some(("swatches".into(), "earth-tones".into())));
 }
+
+/// #4249: the Color Mixer a Shift-click on a Fill chip opens has the Color panel's menu, whose
+/// color modes (Grayscale, RGB, HSB, CMYK, Web Safe RGB) switch the color it shows and edits.
+#[test]
+fn the_mixer_popover_has_the_color_panels_menu() {
+    let mut app = app();
+    app.run("shape.rectangle", json!({"x": 10, "y": 10, "width": 50, "height": 50})).unwrap();
+    app.run("paint.setFill", json!({"color": "#ff0000"})).unwrap();
+    let ctx = context();
+    frame(&mut app, &ctx, vec![], Modifiers::NONE, control_bar);
+    let (fill, _) = chips(&ctx);
+    click(&mut app, &ctx, fill.center(), Modifiers::SHIFT, control_bar);
+    let menu = ctx.viewport(|vp| {
+        vp.prev_pass.widgets.layers().filter(|(l, _)| l.order != egui::Order::Background).flat_map(|(_, w)| w.iter()).find_map(|w| {
+            (w.rect.size() == vec2(18.0, 18.0) && w.info.as_ref().and_then(|i| i.label.as_deref()) == Some("Panel menu")).then_some(w.rect)
+        })
+    });
+    let menu = menu.expect("the mixer has a panel menu button");
+    click(&mut app, &ctx, menu.center(), Modifiers::NONE, control_bar);
+    let shapes = frame(&mut app, &ctx, vec![], Modifiers::NONE, control_bar);
+    for mode in ["Grayscale", "RGB", "HSB", "Web Safe RGB", "Invert", "Complement"] {
+        assert!(menu_item_rect(&shapes, mode).is_some(), "{mode} in the mixer's menu");
+    }
+    let cmyk = menu_item_rect(&shapes, "CMYK").expect("CMYK in the mixer's menu");
+    click(&mut app, &ctx, cmyk.center(), Modifiers::NONE, control_bar);
+    let fill = panels::current_paints(&app).0.color();
+    assert!(matches!(fill, Some(vectorcraft_color::Color::Cmyk { .. })), "the fill is CMYK now: {fill:?}");
+}