# Mesh appears purple after join

After I joined together a mirrored joined duplicate into one single mesh, the duplicated mesh becomes purple:

What is going on here? Do I need to be worried about this? When joining the roof with the base of the building, this doesn't happen.

• where is the purple ( usually a missing texture ) ? – Chebhou Apr 25 '15 at 13:05
• The whole other half of the roof becomes purple, it's pretty easy to see in the picture. – Jesse Brands Apr 25 '15 at 13:05
• try "Recalculate Normals" "Ctrl+N" in edit mode, (still can't see the purple) – Chebhou Apr 25 '15 at 13:07
• there are related answers to this question, but I can't find the question as being asked this way anywhere: but related: blender.stackexchange.com/questions/3606/… – zeffii Apr 25 '15 at 13:45
• @Chebhou It's... well maybe it's not purple, perhaps it's more like dark grey. – Jesse Brands Apr 30 '15 at 14:03

In the normals subheading, select the face icon. Lines (called normals) will start to emit from each face. I've adjusted the size slider so those lines aren't ridiculously large or small. The thing to note here is that if you don't see the line emitting from some faces, that those faces are flipped.