diff -ur nethack-3.4.1/include/decl.h nethack-3.4.1bis/include/decl.h
--- nethack-3.4.1/include/decl.h        Sun Feb 23 14:43:19 2003
+++ nethack-3.4.1bis/include/decl.h     Thu Mar 20 10:45:04 2003
@@ -266,15 +266,16 @@
 
 E NEARDATA struct c_color_names {
     const char *const c_black, *const c_amber, *const c_golden,
-               *const c_light_blue,*const c_red, *const c_green,
-               *const c_silver, *const c_blue, *const c_purple,
-               *const c_white;
+               *const c_light_blue,*const c_red, *const c_orange,
+                *const c_green, *const c_silver, *const c_blue,
+                *const c_purple, *const c_white;
 } c_color_names;
 #define NH_BLACK               c_color_names.c_black
 #define NH_AMBER               c_color_names.c_amber
 #define NH_GOLDEN              c_color_names.c_golden
 #define NH_LIGHT_BLUE          c_color_names.c_light_blue
 #define NH_RED                 c_color_names.c_red
+#define NH_ORANGE               c_color_names.c_orange
 #define NH_GREEN               c_color_names.c_green
 #define NH_SILVER              c_color_names.c_silver
 #define NH_BLUE                        c_color_names.c_blue
diff -ur nethack-3.4.1/src/decl.c nethack-3.4.1bis/src/decl.c
--- nethack-3.4.1/src/decl.c    Sun Feb 23 14:43:25 2003
+++ nethack-3.4.1bis/src/decl.c Thu Mar 20 10:44:04 2003
@@ -211,8 +211,8 @@
 
 NEARDATA struct c_color_names c_color_names = {
        "black", "amber", "golden",
-       "light blue", "red", "green",
+       "light blue", "red", "orange", "green",
        "silver", "blue", "purple",
        "white"
 };
diff -ur nethack-3.4.1/src/potion.c nethack-3.4.1bis/src/potion.c
--- nethack-3.4.1/src/potion.c  Sun Feb 23 14:43:29 2003
+++ nethack-3.4.1bis/src/potion.c       Fri Mar 21 10:53:17 2003
@@ -1743,7 +1743,16 @@
        }
 #endif
 
+        if(potion->otyp == POT_ACID && obj->otyp == CORPSE &&
+           obj->corpsenm == PM_LICHEN & !Blind) {
+               pline("%s %s %s around the edges.", The(cxname(obj)),
+                     otense(obj, "turn"), potion->odiluted ?
+                     hcolor(NH_ORANGE) : hcolor(NH_RED));
+               potion->in_use = FALSE;    /* didn't go poof */
+               return(1);
+       }
+                     
        if(is_poisonable(obj)) {
            if(potion->otyp == POT_SICKNESS && !obj->opoisoned) {
                char buf[BUFSZ];