diff --git a/crates/ui-egui/src/duplicate_paint_tests.rs b/crates/ui-egui/src/duplicate_paint_tests.rs
new file mode 100644
index 00000000..b8ca81c6
--- /dev/null
+++ b/crates/ui-egui/src/duplicate_paint_tests.rs
@@ -0,0 +1,71 @@
+//! A duplicate's fill is its own: recolouring it, with the picker that was open on the original,
+//! leaves the original as it was (#586).
+
+use figcraft_doc::NodeId;
+use figcraft_engine::Session;
+use serde_json::json;
+
+use crate::colorpicker::PickerTarget;
+use crate::layers_drag_tests::Ui;
+
+fn id(v: &serde_json::Value) -> NodeId {
+    NodeId(v["id"].as_u64().or_else(|| v["ids"][0].as_u64()).unwrap())
+}
+
+fn fill(u: &Ui, id: NodeId) -> String {
+    u.app.session.doc().unwrap().node(id).unwrap().fills[0].solid_color().unwrap().to_css_hex()
+}
+
+/// A red rectangle or pen path, selected, with the colour picker of its fill open.
+fn red(vector: bool) -> (Ui, NodeId) {
+    let mut s = Session::new();
+    let a = if vector {
+        id(&s.execute("vector.create", &json!({"points": [[0, 0], [60, 0], [30, 50]], "closed": true})).unwrap())
+    } else {
+        id(&s.execute("shape.rectangle", &json!({"x": 0, "y": 0, "width": 40, "height": 40})).unwrap())
+    };
+    s.execute("fill.set", &json!({"ids": [a], "color": "#FF0000"})).unwrap();
+    s.execute("select.set", &json!({"ids": [a]})).unwrap();
+    let mut u = Ui::new(s);
+    u.app.ui.picker = Some(PickerTarget::Paint { fills: true, index: 0, ids: vec![a] });
+    u.frame(vec![]);
+    (u, a)
+}
+
+/// Duplicate the selection the way `how` names, moved clear of the original; the copy's id.
+fn duplicate(u: &mut Ui, how: &str) -> NodeId {
+    let copy = match how {
+        "duplicate" => id(&u.app.session.execute("edit.duplicate", &json!({"dx": 100})).unwrap()),
+        _ => {
+            u.app.session.execute("edit.copy", &json!({})).unwrap();
+            id(&u.app.session.execute("edit.paste", &json!({"x": 100, "y": 0})).unwrap())
+        }
+    };
+    u.frame(vec![]);
+    u.frame(vec![]);
+    copy
+}
+
+#[test]
+fn recolouring_a_duplicate_leaves_the_original() {
+    for vector in [false, true] {
+        for how in ["duplicate", "paste"] {
+            let (mut u, a) = red(vector);
+            let b = duplicate(&mut u, how);
+            assert_ne!(a, b);
+            assert_eq!(u.app.session.selection(), vec![b], "{how} selects the copy");
+            // The picker opened for the original doesn't follow it onto the copy's edits.
+            let picker = u.app.ui.picker.clone();
+            assert!(
+                !matches!(&picker, Some(PickerTarget::Paint { ids, .. }) if ids.contains(&a)),
+                "vector {vector}, {how}: the picker still edits the original: {picker:?}"
+            );
+            // Recolour the selection as the fill row does.
+            u.app.ui.picker = Some(PickerTarget::Paint { fills: true, index: 0, ids: u.app.session.selection() });
+            u.app.session.execute("fill.set", &json!({"ids": u.app.session.selection(), "color": "#0000FF"})).unwrap();
+            u.frame(vec![]);
+            assert_eq!(fill(&u, b), "#0000FF", "vector {vector}, {how}");
+            assert_eq!(fill(&u, a), "#FF0000", "vector {vector}, {how}: the original keeps its fill");
+        }
+    }
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 8a1e81b8..7bb6dedb 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -87,6 +87,8 @@ mod cursors_tests;
 #[cfg(test)]
 mod dev_mode_tests;
 #[cfg(test)]
+mod duplicate_paint_tests;
+#[cfg(test)]
 mod export_preview_tests;
 #[cfg(test)]
 mod field_tests;