diff --git a/hackem_changelog.txt b/hackem_changelog.txt
index 23c156c5c..710fbf86b 100644
--- a/hackem_changelog.txt
+++ b/hackem_changelog.txt
@@ -16,6 +16,7 @@
 
 Version 1.2.1 (unreleased)
 
+Weapons cannot have the acid or sonic property.
 Revert the sonic protection a toque grants back to just deafness.
 Upgraded items rarely carry over properties if the result is a magical item.
 Two alignment keys can be forged together to create The Key of Access.
diff --git a/include/obj.h b/include/obj.h
index a9073e38d..d6177a025 100644
--- a/include/obj.h
+++ b/include/obj.h
@@ -579,7 +579,7 @@ struct obj {
 #define ITEM_FROST     0x00000002L /* frost damage or resistance */
 #define ITEM_SHOCK     0x00000004L /* shock damage or resistance */
 #define ITEM_VENOM     0x00000008L /* poison damage or resistance */
-#define ITEM_ACID      0x00000010L /* poison damage or resistance */
+#define ITEM_ACID      0x00000010L /* acid damage or resistance */
 #define ITEM_SCREAM    0x00000020L /* sonic damage or resistance */
 #define ITEM_DRLI      0x00000040L /* drains life or resists it */
 #define ITEM_OILSKIN   0x00000080L /* permanently greased */
diff --git a/src/artifact.c b/src/artifact.c
index 98512ada4..da0a48c90 100644
--- a/src/artifact.c
+++ b/src/artifact.c
@@ -450,7 +450,7 @@ boolean allow_detrimental;
 
         /* check for restrictions */
         if ((otmp->oclass == WEAPON_CLASS || is_weptool(otmp))
-            && (j & (ITEM_DRLI | ITEM_FUMBLING | ITEM_HUNGER)))
+            && (j & (ITEM_DRLI | ITEM_SCREAM | ITEM_ACID | ITEM_FUMBLING | ITEM_HUNGER )))
             continue;
 
         if (is_launcher(otmp)
diff --git a/src/objnam.c b/src/objnam.c
index c3dbb577c..b2274349a 100644
--- a/src/objnam.c
+++ b/src/objnam.c
@@ -5459,8 +5459,7 @@ struct obj *no_wish;
             otmp->oerodeproof = (Luck >= 0 || wizard);
     }
 
-    if (otmp->oclass == WEAPON_CLASS || is_weptool(otmp)
-        || otmp->oclass == ARMOR_CLASS) {
+    if (otmp->oclass == WEAPON_CLASS || is_weptool(otmp) || otmp->oclass == ARMOR_CLASS) {
         /* check for restrictions */
         if (objprops & ITEM_FROST)
             objprops &= ~(ITEM_FIRE | ITEM_DRLI | ITEM_SHOCK | ITEM_SCREAM | ITEM_VENOM | ITEM_ACID);
@@ -5487,14 +5486,14 @@ struct obj *no_wish;
                           | ITEM_WARNING | ITEM_FUMBLING | ITEM_HUNGER | ITEM_EXCEL);
 
         if (otmp->oclass == WEAPON_CLASS || is_weptool(otmp))
-            objprops &= ~(ITEM_DRLI | ITEM_FUMBLING | ITEM_HUNGER);
+            objprops &= ~(ITEM_DRLI | ITEM_ACID | ITEM_SCREAM | ITEM_FUMBLING | ITEM_HUNGER);
 
         if (is_launcher(otmp))
-            objprops &= ~(ITEM_FIRE | ITEM_FROST | ITEM_DRLI | ITEM_SCREAM
-                          | ITEM_SHOCK | ITEM_VENOM | ITEM_ACID | ITEM_OILSKIN);
+            objprops &= ~(ITEM_FIRE | ITEM_FROST | ITEM_DRLI | ITEM_SHOCK | ITEM_VENOM | ITEM_ACID | ITEM_SCREAM
+                    | ITEM_OILSKIN);
 
         if (is_ammo(otmp) || is_missile(otmp))
-            objprops &= ~(ITEM_DRLI | ITEM_OILSKIN | ITEM_ESP | ITEM_SEARCHING
+            objprops &= ~(ITEM_DRLI | ITEM_ACID | ITEM_SCREAM | ITEM_OILSKIN | ITEM_ESP | ITEM_SEARCHING
                           | ITEM_WARNING | ITEM_FUMBLING | ITEM_HUNGER | ITEM_EXCEL);
 
         if (otmp->material != CLOTH)