diff --git a/src/app/properties.rs b/src/app/properties.rs
index 5afbf1762..4ec9ae7a6 100644
--- a/src/app/properties.rs
+++ b/src/app/properties.rs
@@ -478,6 +478,10 @@ impl OpenCADStudio {
         for &handle in handles {
             self.tabs[i].scene.mark_entity_dirty(handle);
         }
+        // Solid (ACIS) meshes bake their colour into the mesh, so a colour /
+        // layer change needs an explicit recolour — re-tessellating wires
+        // alone wouldn't update them.
+        self.tabs[i].scene.recolor_meshes();
         self.tabs[i].scene.bump_geometry_no_blocks();
     }
 
diff --git a/src/app/update.rs b/src/app/update.rs
index d2994ac51..8836f6723 100644
--- a/src/app/update.rs
+++ b/src/app/update.rs
@@ -5135,11 +5135,12 @@ impl OpenCADStudio {
                     self.ribbon.active_color = color;
                 } else {
                     self.push_undo_snapshot(i, "CHPROP");
-                    for handle in handles {
+                    for &handle in &handles {
                         if let Some(entity) = self.tabs[i].scene.document.get_entity_mut(handle) {
                             crate::scene::view::dispatch::apply_color(entity, color);
                         }
                     }
+                    self.invalidate_property_targets(i, &handles);
                     self.tabs[i].dirty = true;
                     self.ribbon.active_color = color;
                     self.refresh_properties();
diff --git a/src/scene/mod.rs b/src/scene/mod.rs
index 5684e8cf6..7e7780a50 100644
--- a/src/scene/mod.rs
+++ b/src/scene/mod.rs
@@ -1095,16 +1095,19 @@ impl Scene {
     pub fn recolor_meshes(&mut self) {
         // Cache colour lookups by handle to avoid borrowing the document
         // re-entrantly through `render_style` inside a `&mut self` loop.
+        // Covers both top-level solid meshes and block-definition meshes
+        // (instanced per INSERT), so a solid recolours wherever it lives.
         let colors: HashMap<Handle, [f32; 4]> = self
             .meshes
             .keys()
+            .chain(self.block_meshes.keys())
             .filter_map(|&h| {
                 self.document
                     .get_entity(h)
                     .map(|e| (h, self.render_style(e).0))
             })
             .collect();
-        for (h, set) in self.meshes.iter_mut() {
+        for (h, set) in self.meshes.iter_mut().chain(self.block_meshes.iter_mut()) {
             if let Some(&c) = colors.get(h) {
                 for lod in &mut set.lods {
                     lod.color = c;