diff --git a/ChangeLog b/ChangeLog
index 11bfbd276..9f7beb479 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+New ground type, acid (based on lava archetype but color
+has changed and attacktype changed from fire to acid.)
+ground/acid.arc
+ground/acid.base.11*.png
+ground/acid.face
+ground/permanent_acid.face
+ground/smooth/acid_S.base.11*.png
+Rick Tanner 2015-09-30
+
 New fantasy ore type and graphic called silver frost.
 jewel/ores/silver_frost.base.111.png
 jewel/ores/silverfrost.arc
diff --git a/ground/acid.arc b/ground/acid.arc
new file mode 100644
index 000000000..d27cba7f3
--- /dev/null
+++ b/ground/acid.arc
@@ -0,0 +1,50 @@
+# a specific type of spell effect (cone) which operates
+# as a ground object.
+Object acid
+type 102
+subtype 7
+level 1
+move_on walk
+wc -30
+name acid
+face acid.111
+animation acid
+smoothface acid.111 acid_S.111
+smoothface acid.112 acid_S.112
+smoothface acid.113 acid_S.113
+smoothface acid.114 acid_S.114
+smoothface acid.115 acid_S.115
+smoothlevel 28
+speed 0.2
+no_pick 1
+attacktype 64
+duration 60
+dam 3
+is_floor 1
+move_block boat swim
+end
+#
+Object permanent_acid
+type 102
+subtype 7
+level 1
+move_on walk
+wc -30
+lifesave 1
+name acid
+face acid.111
+animation permanent_acid
+speed 0.2
+no_pick 1
+smoothlevel 28
+smoothface acid.111 acid_S.111
+smoothface acid.112 acid_S.112
+smoothface acid.113 acid_S.113
+smoothface acid.114 acid_S.114
+smoothface acid.115 acid_S.115
+attacktype 64
+hp 1
+dam 3
+is_floor 1
+move_block boat swim
+end
diff --git a/ground/acid.base.111.png b/ground/acid.base.111.png
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diff --git a/ground/acid.base.112.png b/ground/acid.base.112.png
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diff --git a/ground/acid.base.113.png b/ground/acid.base.113.png
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diff --git a/ground/acid.base.114.png b/ground/acid.base.114.png
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diff --git a/ground/acid.base.115.png b/ground/acid.base.115.png
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diff --git a/ground/acid.face b/ground/acid.face
new file mode 100644
index 000000000..6d2e9f37a
--- /dev/null
+++ b/ground/acid.face
@@ -0,0 +1,32 @@
+animation acid
+acid.111
+acid.112
+acid.113
+acid.114
+acid.115
+mina
+face acid.111
+is_floor 1
+magicmap yellow
+visibility 100
+end
+face acid.112
+is_floor 1
+magicmap yellow
+visibility 100
+end
+face acid.113
+is_floor 1
+magicmap yellow
+visibility 100
+end
+face acid.114
+is_floor 1
+magicmap yellow
+visibility 100
+end
+face acid.115
+is_floor 1
+magicmap yellow
+visibility 100
+end
diff --git a/ground/permanent_acid.face b/ground/permanent_acid.face
new file mode 100644
index 000000000..2b3cd9c44
--- /dev/null
+++ b/ground/permanent_acid.face
@@ -0,0 +1,7 @@
+animation permanent_acid
+acid.111
+acid.112
+acid.113
+acid.114
+acid.115
+mina
diff --git a/ground/smooth/acid_S.base.111.png b/ground/smooth/acid_S.base.111.png
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diff --git a/ground/smooth/acid_S.base.113.png b/ground/smooth/acid_S.base.113.png
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diff --git a/ground/smooth/acid_S.base.114.png b/ground/smooth/acid_S.base.114.png
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diff --git a/ground/smooth/acid_S.base.115.png b/ground/smooth/acid_S.base.115.png
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