diff --git a/changelog.txt b/changelog.txt
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--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,5 @@
+2014-07-11: Added MTZ test tube and deep red marble images.
+
 2014-07-07: New imagery for Minetest/minetest_game 0.4.10
 
 2014-07-04: New apple blossom image for nature mod.
diff --git a/mtz_marble_deepred.png b/mtz_marble_deepred.png
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diff --git a/mtz_testtube_neutral.png b/mtz_testtube_neutral.png
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diff --git a/mtz_testtube_red.png b/mtz_testtube_red.png
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