diff --git a/src/Gui/ViewProviderOriginFeature.cpp b/src/Gui/ViewProviderOriginFeature.cpp
index 6e360c06ddf3..df57b9b0447e 100644
--- a/src/Gui/ViewProviderOriginFeature.cpp
+++ b/src/Gui/ViewProviderOriginFeature.cpp
@@ -51,6 +51,7 @@ ViewProviderOriginFeature::ViewProviderOriginFeature () {
     QT_TRANSLATE_NOOP("App::Property", "Visual size of the feature"));
 
     ShapeColor.setValue ( ViewProviderOrigin::defaultColor ); // Set default color for origin (light-blue)
+    Transparency.setValue(0);
     BoundingBox.setStatus(App::Property::Hidden, true); // Hide Boundingbox from the user due to it doesn't make sense
 
     // Create node for scaling the origin
diff --git a/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp b/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
index cfc8bf172d61..b7829b9521b8 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
+++ b/src/Mod/Fem/Gui/ViewProviderFemMesh.cpp
@@ -197,6 +197,7 @@ ViewProviderFemMesh::ViewProviderFemMesh()
     LineWidth.setConstraints(&floatRange);
 
     ShapeColor.setValue(App::Color(1.0f, 0.7f, 0.0f));
+    Transparency.setValue(0);
     ADD_PROPERTY(BackfaceCulling, (true));
     ADD_PROPERTY(ShowInner, (false));
     ADD_PROPERTY(MaxFacesShowInner, (50000));
diff --git a/src/Mod/Import/Gui/dxf/ImpExpDxfGui.cpp b/src/Mod/Import/Gui/dxf/ImpExpDxfGui.cpp
index a9888d115d26..89e04b819bb8 100644
--- a/src/Mod/Import/Gui/dxf/ImpExpDxfGui.cpp
+++ b/src/Mod/Import/Gui/dxf/ImpExpDxfGui.cpp
@@ -82,6 +82,7 @@ void ImpExpDxfReadGui::ApplyGuiStyles(Part::Feature* object)
     view->LineColor.setValue(color);
     view->PointColor.setValue(color);
     view->ShapeColor.setValue(color);
+    view->Transparency.setValue(0);
 }
 
 void ImpExpDxfReadGui::ApplyGuiStyles(App::FeaturePython* object)
diff --git a/src/Mod/Part/CMakeLists.txt b/src/Mod/Part/CMakeLists.txt
index b7502d6e7776..767b1a43d904 100644
--- a/src/Mod/Part/CMakeLists.txt
+++ b/src/Mod/Part/CMakeLists.txt
@@ -69,6 +69,7 @@ set(Part_tests
     parttests/regression_tests.py
     parttests/TopoShapeListTest.py
     parttests/ColorPerFaceTest.py
+    parttests/ColorTransparencyTest.py
 )
 
 add_custom_target(PartScripts ALL SOURCES
diff --git a/src/Mod/Part/Gui/DlgProjectionOnSurface.cpp b/src/Mod/Part/Gui/DlgProjectionOnSurface.cpp
index 4d0704f9818e..c36b7b5ef31a 100644
--- a/src/Mod/Part/Gui/DlgProjectionOnSurface.cpp
+++ b/src/Mod/Part/Gui/DlgProjectionOnSurface.cpp
@@ -638,6 +638,7 @@ void PartGui::DlgProjectionOnSurface::show_projected_shapes(const std::vector<SS
     vp->LineColor.setValue(0x8ae23400);
     vp->ShapeColor.setValue(0x8ae23400);
     vp->PointColor.setValue(0x8ae23400);
+    vp->Transparency.setValue(0);
   }
 }
 
diff --git a/src/Mod/Part/TestPartGui.py b/src/Mod/Part/TestPartGui.py
index 9527da2fbe96..dc207cc83125 100644
--- a/src/Mod/Part/TestPartGui.py
+++ b/src/Mod/Part/TestPartGui.py
@@ -44,6 +44,7 @@ def findDockWidget(name):
 #---------------------------------------------------------------------------
 """
 from parttests.ColorPerFaceTest import ColorPerFaceTest
+from parttests.ColorTransparencyTest import ColorTransparencyTest
 
 
 #class PartGuiTestCases(unittest.TestCase):
diff --git a/src/Mod/Part/parttests/ColorTransparencyTest.py b/src/Mod/Part/parttests/ColorTransparencyTest.py
new file mode 100644
index 000000000000..f948bdac8a55
--- /dev/null
+++ b/src/Mod/Part/parttests/ColorTransparencyTest.py
@@ -0,0 +1,58 @@
+import unittest
+
+import FreeCAD as App
+
+
+class ColorTransparencyTest(unittest.TestCase):
+
+    def setUp(self):
+        self._doc = App.newDocument()
+        self._pg = App.ParamGet('User parameter:BaseApp/Preferences/View')
+        self._backup_default_transparency = self._pg.GetInt('DefaultShapeTransparency')
+        self._backup_default_shapecolor = self._pg.GetUnsigned('DefaultShapeColor')
+
+
+    def tearDown(self):
+        App.closeDocument(self._doc.Name)
+        self._pg.SetInt('DefaultShapeTransparency', self._backup_default_transparency)
+        self._pg.SetUnsigned('DefaultShapeColor', self._backup_default_shapecolor)
+
+
+    def test_default_shape_transparency(self):
+        """
+        related: https://github.com/FreeCAD/FreeCAD/pull/11866
+        related: https://github.com/FreeCAD/FreeCAD/pull/11586
+        """
+        transparency = 70
+        self._pg.SetInt('DefaultShapeTransparency', transparency)
+        obj = self._doc.addObject('Part::Box')
+        assert obj.ViewObject.Transparency == transparency
+        obj.ViewObject.ShapeColor = (0.5, 0.0, 0.0)
+
+        self.assertEqual(obj.ViewObject.Transparency, transparency,
+            'transparency was unexpectedly changed to {} when changing the color.'.format(
+            obj.ViewObject.Transparency))
+
+
+    def test_default_shape_color(self):
+        """
+        related: https://github.com/FreeCAD/FreeCAD/pull/11866
+        """
+        self._pg.SetUnsigned('DefaultShapeColor', 0xff000000)  # red
+        obj = self._doc.addObject('Part::Box')
+
+        self.assertEqual(obj.ViewObject.ShapeColor, (1.0, 0.0, 0.0, 0.0),
+            'default shape color was not set correctly')
+
+
+    def test_app_plane_transparency(self):
+        """
+        related: https://github.com/FreeCAD/FreeCAD/pull/12064
+        """
+        self._pg.SetInt('DefaultShapeTransparency', 70)
+        obj = self._doc.addObject('App::Origin')
+        t = self._doc.findObjects('App::Plane')[0].ViewObject.Transparency
+
+        self.assertEqual(t, 0,
+            'transparency of App::Plane object is {} instead of 0'.format(t))
+