diff --git a/src/main_window.cpp b/src/main_window.cpp
index d9568ee..f3d3632 100644
--- a/src/main_window.cpp
+++ b/src/main_window.cpp
@@ -1,4 +1,5 @@
 #include "main_window.h"
+#include "mesh_processing.h"
 
 #include <QApplication>
 #include <QFileDialog>
@@ -33,14 +34,17 @@ MainWindow::MainWindow(QWidget *parent)
 
 
 void MainWindow::open(const QString &path) {
-	if (!OpenMesh::IO::read_mesh(mesh, path.toUtf8().constData())) {
+	OpenMesh::IO::Options options;
+	options.set(OpenMesh::IO::Options::VertexColor);
+	if (!OpenMesh::IO::read_mesh(mesh, path.toUtf8().constData(), options)) {
 		qWarning() << "Failed to read" << path;
 		return;
 	}
 	for (const VertexHandle &vh : mesh.vertices()) {
-		mesh.set_color(vh, MyMesh::Color(.5, .5, .5));
+		mesh.set_color(vh, MyMesh::Color(0, 0, 0));
 	}
 	if (glm != nullptr) mesh_viewer.removeOpenGLMesh(glm);
+ 	findHoles(mesh);
 	glm = mesh_viewer.addOpenGLMeshFromOpenMesh(&mesh);
 	for (QAction *a : toolbar_actions) {
 		a->setEnabled(true);
diff --git a/src/mesh_processing.cpp b/src/mesh_processing.cpp
new file mode 100644
index 0000000..6908aca
--- /dev/null
+++ b/src/mesh_processing.cpp
@@ -0,0 +1,11 @@
+#include "mesh_processing.h"
+
+
+void findHoles(MyMesh &mesh) {
+	for (const MyMesh::HalfedgeHandle &eh : mesh.halfedges()) {
+		if (mesh.is_boundary(eh)) {
+			MyMesh::VertexHandle vh = mesh.to_vertex_handle(eh);
+			mesh.set_color(vh, {.8, .2, .7});
+		}
+	}
+}
diff --git a/src/mesh_processing.h b/src/mesh_processing.h
new file mode 100644
index 0000000..bc84b3f
--- /dev/null
+++ b/src/mesh_processing.h
@@ -0,0 +1,10 @@
+#ifndef MESH_PROCESSING_H
+#define MESH_PROCESSING_H
+
+#include "my_mesh.h"
+
+
+void findHoles(MyMesh &mesh);
+
+
+#endif
\ No newline at end of file
diff --git a/src/mesh_viewer.cpp b/src/mesh_viewer.cpp
index e705e15..da532e0 100644
--- a/src/mesh_viewer.cpp
+++ b/src/mesh_viewer.cpp
@@ -28,8 +28,9 @@ uniform bool wireframe;
 uniform float alpha;
 
 void main() {
-	if (wireframe)
-		gl_FragColor = vec4(wf_col, alpha);
+	if (!wireframe)
+		// gl_FragColor = vec4(wf_col, alpha);
+		gl_FragColor = vec4(.5, .5, .5, 1);
 	else
 		gl_FragColor = vec4(frag_col, alpha);
 }
@@ -169,7 +170,7 @@ void MeshViewer::paintGL() {
 		glUniform1f(wireframe_attr, 1);
 		glDrawArrays(GL_TRIANGLES, 0, m.nverts);
 		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-		glLineWidth(1);
+		glLineWidth(3);
 		glUniform1f(wireframe_attr, 0);
 	}
 }
diff --git a/tp.pro b/tp.pro
index e8be321..7dcb269 100644
--- a/tp.pro
+++ b/tp.pro
@@ -19,7 +19,9 @@ win32 {
 HEADERS += src/my_mesh.h
 HEADERS += src/main_window.h
 HEADERS += src/mesh_viewer.h
+HEADERS += src/mesh_processing.h
 
 SOURCES += src/main.cpp
 SOURCES += src/main_window.cpp
 SOURCES += src/mesh_viewer.cpp
+SOURCES += src/mesh_processing.cpp