diff --git a/libtest.png b/libtest.png
index 7c3edd2..e85cbe3 100644
Binary files a/libtest.png and b/libtest.png differ
diff --git a/tests/png/butt_box.png b/tests/png/butt_box.png
index f4d38ab..cff20d1 100644
Binary files a/tests/png/butt_box.png and b/tests/png/butt_box.png differ
diff --git a/tests/png/sheets.png b/tests/png/sheets.png
index 6a369f2..fe69bdd 100644
Binary files a/tests/png/sheets.png and b/tests/png/sheets.png differ
diff --git a/vitamins/sheets.scad b/vitamins/sheets.scad
index 1260695..ad4346e 100644
--- a/vitamins/sheets.scad
+++ b/vitamins/sheets.scad
@@ -38,7 +38,7 @@ PMMA8     = [ "PMMA8",     "Sheet acrylic",           8, [1,   1,   1,   0.5  ],
 PMMA10    = [ "PMMA10",    "Sheet acrylic",          10, [1,   1,   1,   0.5  ], false];   // ~3/8"
 glass2    = [ "glass2",    "Sheet glass",             2, [1,   1,   1,   0.25 ], false];
 DiBond    = [ "DiBond",    "Sheet DiBond",            3, [0.2, 0.2, 0.2, 1    ], false];
-DiBond6   = [ "DiBond6",   "Sheet DiBond",            6, "RoyalBlue",            false];
+DiBond6   = [ "DiBond6",   "Sheet DiBond",            6, [0.2, 0.2, 0.2, 1    ], false];
 Cardboard = [ "Cardboard", "Corrugated cardboard",    5, [0.8, 0.6, 0.3, 1    ], false];
 FoilTape  = [ "FoilTape",  "Aluminium foil tape",   0.05,[0.9, 0.9, 0.9, 1    ], false];
 Foam20    = [ "Foam20",    "Foam sponge",             20,[0.3, 0.3, 0.3, 1    ], true];