diff --git a/src/app/script/app_object.cpp b/src/app/script/app_object.cpp
index db6d6417f..778d60b3a 100644
--- a/src/app/script/app_object.cpp
+++ b/src/app/script/app_object.cpp
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2018-2023  Igara Studio S.A.
+// Copyright (C) 2018-2024  Igara Studio S.A.
 // Copyright (C) 2015-2018  David Capello
 //
 // This program is distributed under the terms of
@@ -365,6 +365,9 @@ int App_useTool(lua_State* L)
   type = lua_getfield(L, 1, "bgColor");
   if (type != LUA_TNIL)
     params.bg = convert_args_into_color(L, -1);
+  else if (params.fg.getType() ==
+           Preferences::instance().colorBar.bgColor().getType())
+    params.bg = Preferences::instance().colorBar.bgColor();
   else
     params.bg = params.fg;
   lua_pop(L, 1);
@@ -476,6 +479,13 @@ int App_useTool(lua_State* L)
     bool first = true;
 
     lua_pushnil(L);
+    tools::ToolBox* toolbox = App::instance()->toolBox();
+    const bool isSelectionInk =
+      (params.ink == toolbox->getInkById(tools::WellKnownInks::Selection));
+    const tools::Pointer::Button button =
+      (!isSelectionInk ? (buttonIdx == 0 ? tools::Pointer::Button::Left :
+                                           tools::Pointer::Button::Right) :
+                         tools::Pointer::Button::Left);
     while (lua_next(L, -2) != 0) {
       gfx::Point pt = convert_args_into_point(L, -1);
 
@@ -483,7 +493,7 @@ int App_useTool(lua_State* L)
         pt,
         // TODO configurable params
         tools::Vec2(0.0f, 0.0f),
-        tools::Pointer::Button::Left,
+        button,
         tools::Pointer::Type::Unknown,
         0.0f);
       if (first) {
diff --git a/src/app/ui_context.cpp b/src/app/ui_context.cpp
index 018ce8259..888c02f93 100644
--- a/src/app/ui_context.cpp
+++ b/src/app/ui_context.cpp
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2019-2023  Igara Studio S.A.
+// Copyright (C) 2019-2024  Igara Studio S.A.
 // Copyright (C) 2001-2018  David Capello
 //
 // This program is distributed under the terms of
@@ -366,6 +366,14 @@ void UIContext::onGetActiveSite(Site* site) const
           colorBar->getPaletteView()->getSelectedEntries(picks);
           site->selectedColors(picks);
         }
+        else if (colorBar &&
+                 colorBar->getTilesView()->getSelectedEntriesCount() > 0) {
+          site->focus(Site::InColorBar);
+
+          doc::PalettePicks picks;
+          colorBar->getTilesView()->getSelectedEntries(picks);
+          site->selectedTiles(picks);
+        }
         else {
           site->focus(Site::InEditor);
         }
diff --git a/tests/scripts/inks.lua b/tests/scripts/inks.lua
index 9cf3e9ca0..8dd11b334 100644
--- a/tests/scripts/inks.lua
+++ b/tests/scripts/inks.lua
@@ -331,4 +331,60 @@ do
             { 1, 0, 1,
               0, 2, 0,
               1, 0, 1})
+end
+
+----------------------------------------------------------------------
+-- Tests for Eraser Tool with Indexed image + background layer +
+-- mask color present in the palette
+----------------------------------------------------------------------
+do
+  local s = Sprite(3, 3, ColorMode.INDEXED)
+  local p = s.palettes[1]
+  p:setColor(0, Color{ r=0  , g=0  , b=0  , a=255 })
+  p:setColor(1, Color{ r=255, g=0  , b=0  , a=255 })
+  p:setColor(2, Color{ r=0  , g=255, b=0  , a=255 })
+  p:setColor(3, Color{ r=0  , g=0  , b=255, a=255 })
+  p:setColor(4, Color{ r=255, g=255, b=0  , a=255 })
+  p:setColor(5, Color{ r=255, g=255, b=255, a=255 })
+  p:setColor(6, Color{ r=0  , g=0  , b=0  , a=0   })
+
+  app.fgColor = 0
+  app.bgColor = 0
+  app.command.BackgroundFromLayer()
+  s.transparentColor = 6
+  array_to_pixels({ 0, 0, 0,
+                    0, 0, 0,
+                    0, 0, 0 }, app.activeImage)
+
+  app.fgColor = 1
+  app.bgColor = 6
+  app.useTool{ tool='pencil',
+               points={ Point(0, 0), Point(2, 0)} }
+  app.useTool{ tool='pencil',
+               color=2,
+               points={ Point(0, 1), Point(2, 1)} }
+  app.useTool{ tool='pencil',
+               color=3,
+               points={ Point(0, 2), Point(2, 2)} }
+  array_to_pixels({ 1, 1, 1,
+                    2, 2, 2,
+                    3, 3, 3 }, app.activeImage)
+
+  app.fgColor = 2
+  app.bgColor = 6
+  app.useTool{ tool='eraser',
+               button=MouseButton.LEFT,
+               points={ Point(0, 0), Point(0, 2) } }
+  expect_img(app.activeImage,
+            {  0, 1, 1,
+               0, 2, 2,
+               0, 3, 3 })
+
+  app.useTool{ tool='eraser',
+               button=MouseButton.RIGHT,
+               points={ Point(1, 0), Point(1, 2) } }
+  expect_img(app.activeImage,
+            {  0, 1, 1,
+               0, 0, 2,
+               0, 3, 3 })
 end
\ No newline at end of file