diff --git a/src/activities/advanced_colors/resource/README b/src/activities/advanced_colors/resource/README
index a6c129061..2cd70fdfd 100644
--- a/src/activities/advanced_colors/resource/README
+++ b/src/activities/advanced_colors/resource/README
@@ -1,4 +1,78 @@
-Copyright: Timothée Giet, 2015
-License: Public Domain
+Copyright: Timothée Giet, 2019
+License: CC-BY-SA 4.0
 Files:
-*_butterfly.svg
+absinthe_butterfly.svg
+alabaster_butterfly.svg
+almond_butterfly.svg
+amber_butterfly.svg
+amethyst_butterfly.svg
+anise_butterfly.svg
+aquamarine_butterfly.svg
+aubergine_butterfly.svg
+auburn_butterfly.svg
+azure_butterfly.svg
+bistre_butterfly.svg
+celadon_butterfly.svg
+cerulean_butterfly.svg
+ceruse_butterfly.svg
+chartreuse_butterfly.svg
+chestnut_butterfly.svg
+claret_butterfly.svg
+cobalt_butterfly.svg
+coral_butterfly.svg
+corn_butterfly.svg
+crimson_butterfly.svg
+cyan_butterfly.svg
+dark_purple_butterfly.svg
+dove_butterfly.svg
+emerald_butterfly.svg
+fawn_butterfly.svg
+fuchsia_butterfly.svg
+garnet_butterfly.svg
+glaucous_butterfly.svg
+greyish_blue_butterfly.svg
+greyish-brown_butterfly.svg
+indigo_butterfly.svg
+ivory_butterfly.svg
+jade_butterfly.svg
+larch_butterfly.svg
+lavender_butterfly.svg
+lichen_butterfly.svg
+lilac_butterfly.svg
+lime_butterfly.svg
+magenta_butterfly.svg
+mahogany_butterfly.svg
+malachite_butterfly.svg
+mauve_butterfly.svg
+mimosa_butterfly.svg
+navy_butterfly.svg
+ochre_butterfly.svg
+olive_butterfly.svg
+opaline_butterfly.svg
+pistachio_butterfly.svg
+platinum_butterfly.svg
+plum_butterfly.svg
+prussian_blue_butterfly.svg
+purple_butterfly.svg
+ruby_butterfly.svg
+rust_butterfly.svg
+saffron_butterfly.svg
+sage_butterfly.svg
+salmon_butterfly.svg
+sapphire_butterfly.svg
+sepia_butterfly.svg
+sienna_butterfly.svg
+sulphur_butterfly.svg
+tea_butterfly.svg
+turquoise_butterfly.svg
+ultramarine_butterfly.svg
+vanilla_butterfly.svg
+verdigris_butterfly.svg
+vermilion_butterfly.svg
+veronese_butterfly.svg
+wine_butterfly.svg
+
+
+/* Notes:
+ * Color codes gathered on different websites. A few are adapted a little to make all items easier to differentiate.
+ */
diff --git a/src/activities/advanced_colors/resource/absinthe_butterfly.svg b/src/activities/advanced_colors/resource/absinthe_butterfly.svg
index bc5d3411c..4eb1890ca 100644
--- a/src/activities/advanced_colors/resource/absinthe_butterfly.svg
+++ b/src/activities/advanced_colors/resource/absinthe_butterfly.svg
@@ -1,141 +1,139 @@
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