diff --git a/home/.bash_profile.d/prompt b/home/.bash_profile.d/prompt
index 9ca457a..0c63eaa 100644
--- a/home/.bash_profile.d/prompt
+++ b/home/.bash_profile.d/prompt
@@ -1,7 +1,52 @@
 # If not running interactively, don't do anything else
 [[ $- != *i* ]] && return
 
-# add a fancy colored prompt. may be best to copy and alter colors for machine Identification
+# Color mapping
+grey='\[\033[1;30m\]'
+red='\[\033[0;31m\]'
+RED='\[\033[1;31m\]'
+green='\[\033[0;32m\]'
+GREEN='\[\033[1;32m\]'
+yellow='\[\033[0;33m\]'
+YELLOW='\[\033[1;33m\]'
+purple='\[\033[0;35m\]'
+PURPLE='\[\033[1;35m\]'
+white='\[\033[0;37m\]'
+WHITE='\[\033[1;37m\]'
+blue='\[\033[0;34m\]'
+BLUE='\[\033[1;34m\]'
+cyan='\[\033[0;36m\]'
+CYAN='\[\033[1;36m\]'
+NC='\[\033[0m\]'
 
-export PS1='\[\033[01;32m\]\u@\h\[\033[00m\] \[\033[01;34m\]\w \$\[\033[00m\] '
+#Default colors.
+c1=$GREEN
+c2=$BLUE
+trail='\$'
+pre=''
 
+# RED if logged in as root.
+if [ "$EUID" -eq 0 ]
+then
+    c1=$RED
+    trail='#'
+# Toolbox
+elif [ -f /run/.containerenv ] && [ -f /run/.toolboxenv ]
+then
+    trail='🔧'
+    c1=$YELLOW
+else
+# Per-machine colors.
+case `hostname -s` in
+    polaris)
+        c1=$BLUE
+        c2=$CYAN
+        ;;
+    arcadia)
+        c1=$CYAN
+        c2=$GREEN
+        ;;
+esac
+fi
+
+export PS1="${pre}${c1}\u@\h${NC} ${c2}\w ${trail}${NC} "