diff --git a/changelog.txt b/changelog.txt
index 09c0559..ea30f32 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.7.0
+Date: 2021-06-16
+  Features:
+    - Recipe bypass setting
+---------------------------------------------------------------------------------------------------
 Version: 0.6.14
 Date: 2021-06-02
   Features:
diff --git a/info.json b/info.json
index d8b15e6..b064ecc 100644
--- a/info.json
+++ b/info.json
@@ -1,6 +1,6 @@
 {
     "name": "bzsilicon",
-    "version": "0.6.14",
+    "version": "0.7.0",
     "factorio_version": "1.1",
     "title": "Silica & Silicon",
     "author": "Brevven",
diff --git a/locale/en/silicon.cfg b/locale/en/silicon.cfg
index 0088f12..d23948a 100644
--- a/locale/en/silicon.cfg
+++ b/locale/en/silicon.cfg
@@ -38,9 +38,11 @@ optical-fiber=__ITEM__optical-fiber__
 # Settings 
 
 [mod-setting-name]
+bzsilicon-recipe-bypass=Bypass recipes
 bzsilicon-more-intermediates=Enable more intermediate recipes such as silicon wafers.
 bzsilicon-bio-crushed-stone=When using Bio Industries, use crushed stone to make silica.
 
 [mod-setting-description]
+bzsilicon-recipe-bypass=Skip modifying these recipes (comma-separated list).
 bzsilicon-more-intermediates=More complex production chains. Optional in vanilla, Krastorio 2, etc. [color=red]Required for Bio Industries.[/color]
 bzsilicon-bio-crushed-stone=This setting is experimental, and may be removed in a future update. It's strongly recommended to keep it enabled. Only disable if your UPS is dropping due to inserter count. Added per user request.
diff --git a/settings.lua b/settings.lua
index ce84167..2796577 100644
--- a/settings.lua
+++ b/settings.lua
@@ -1,5 +1,11 @@
-data:extend(
-{
+data:extend( {
+  {
+		type = "string-setting",
+		name = "bzsilicon-recipe-bypass",
+		setting_type = "startup",
+		default_value = "",
+    allow_blank = true,
+	},
   {
 		type = "string-setting",
 		name = "bzsilicon-more-intermediates",
diff --git a/util.lua b/util.lua
index 6034fa1..f38d60d 100644
--- a/util.lua
+++ b/util.lua
@@ -1,7 +1,16 @@
 local util = {}
 
+util.name = "bzsilicon"
 util.silicon_processing = mods["Krastorio2"] and "kr-silicon-processing" or "silicon-processing"
 
+function util.more_intermediates()
+  return mods["Bio_Industries"] or util.get_setting("bzsilicon-more-intermediates") == "yes"
+end
+
+function util.use_bio_crushed_stone()
+  return mods["Bio_Industries"] and util.get_setting("bzsilicon-bio-crushed-stone") == true
+end
+
 function util.get_setting(name)
   if settings.startup[name] == nil then
     return nil
@@ -9,12 +18,11 @@ function util.get_setting(name)
   return settings.startup[name].value
 end
 
-function util.more_intermediates()
-  return mods["Bio_Industries"] or util.get_setting("bzsilicon-more-intermediates") == "yes"
-end
-
-function util.use_bio_crushed_stone()
-  return mods["Bio_Industries"] and util.get_setting("bzsilicon-bio-crushed-stone") == true
+local bypass = {}
+if util.get_setting(util.name.."-recipe-bypass") then 
+  for recipe in string.gmatch(util.get_setting(util.name.."-recipe-bypass"), '[^",%s]+') do
+    bypass[recipe] = true
+  end
 end
 
 function util.get_stack_size(default) 
@@ -25,26 +33,64 @@ function util.get_stack_size(default)
   return default
 end
 
--- Remove an element of type t and name from data.raw
-function util.remove_raw(t, name)
-  for i, elem in pairs(data.raw[t]) do
-    if elem.name == name then 
-      data.raw[t][i] = nil
-      break
+-- check if a table contains a sought value
+function util.contains(table, sought)
+  for i, value in pairs(table) do
+    if value == sought then
+      return true
     end
   end
+  return false
 end
 
 -- Add a prerequisite to a given technology
 function util.add_prerequisite(technology_name, prerequisite)
+  technology = data.raw.technology[technology_name]
+  if technology and data.raw.technology[prerequisite] then
+    if technology.prerequisites then
+      table.insert(technology.prerequisites, prerequisite)
+    else
+      technology.prerequisites = {prerequisite}
+    end
+  end
+end
+
+-- Remove a prerequisite from a given technology
+function util.remove_prerequisite(technology_name, prerequisite)
+  technology = data.raw.technology[technology_name]
+  local index = -1
+  if technology and data.raw.technology[prerequisite] then
+    for i, prereq in pairs(technology.prerequisites) do
+      if prereq == prerequisite then
+        index = i
+        break
+      end
+    end
+    if index > -1 then
+      table.remove(technology.prerequisites, index)
+    end
+  end
+end
+
+-- Add an effect to a given technology
+function util.add_effect(technology_name, effect)
   technology = data.raw.technology[technology_name]
   if technology then
-    table.insert(technology.prerequisites, prerequisite)
+    table.insert(technology.effects, effect)
+  end
+end
+
+-- Set technology ingredients
+function util.set_tech_recipe(technology_name, ingredients)
+  technology = data.raw.technology[technology_name]
+  if technology then
+    technology.unit.ingredients = ingredients
   end
 end
 
 -- Add a given quantity of ingredient to a given recipe
 function util.add_ingredient(recipe_name, ingredient, quantity)
+  if bypass[recipe_name] then return end
   if data.raw.recipe[recipe_name] then
     add_ingredient(data.raw.recipe[recipe_name], ingredient, quantity)
     add_ingredient(data.raw.recipe[recipe_name].normal, ingredient, quantity)
@@ -54,8 +100,9 @@ end
 
 function add_ingredient(recipe, ingredient, quantity)
   if recipe ~= nil and recipe.ingredients ~= nil then
-    for _, existing in ipairs(recipe.ingredients) do 
-      if ingredient == existing.name or ingredient == existing[1] then
+    for i, existing in pairs(recipe.ingredients) do
+      if existing[1] == ingredient or existing.name == ingredient then
+        log("Not adding "..ingredient.." -- duplicate")
         return
       end
     end
@@ -63,21 +110,42 @@ function add_ingredient(recipe, ingredient, quantity)
   end
 end
 
--- Replace one ingredien with another in a recipe
-function util.replace_ingredient(recipe_name, old, new)
+-- Add a given quantity of product to a given recipe. 
+-- Only works for recipes with multiple products
+function util.add_product(recipe_name, product)
   if data.raw.recipe[recipe_name] then
-   replace_ingredient(data.raw.recipe[recipe_name], old, new)
-   replace_ingredient(data.raw.recipe[recipe_name].normal, old, new)
-   replace_ingredient(data.raw.recipe[recipe_name].expensive, old, new)
+    add_product(data.raw.recipe[recipe_name], product)
+    add_product(data.raw.recipe[recipe_name].normal, product)
+    add_product(data.raw.recipe[recipe_name].expensive, product)
+  end
+end
+
+function add_product(recipe, product)
+  if recipe ~= nil and recipe.results ~= nil then
+    table.insert(recipe.results, product)
+  end
+end
+
+-- Replace one ingredient with another in a recipe
+function util.replace_ingredient(recipe_name, old, new)
+  if bypass[recipe_name] then return end
+  if data.raw.recipe[recipe_name] then
+    replace_ingredient(data.raw.recipe[recipe_name], old, new)
+    replace_ingredient(data.raw.recipe[recipe_name].normal, old, new)
+    replace_ingredient(data.raw.recipe[recipe_name].expensive, old, new)
   end
 end
 
 function replace_ingredient(recipe, old, new)
 	if recipe ~= nil and recipe.ingredients ~= nil then
+    for i, existing in pairs(recipe.ingredients) do
+      if existing[1] == new or existing.name == new then
+        log("Not adding "..new.." -- duplicate")
+        return
+      end
+    end
 		for i, ingredient in pairs(recipe.ingredients) do 
-			-- For final fixes
 			if ingredient.name == old then ingredient.name = new end
-			-- For updates
 			if ingredient[1] == old then ingredient[1] = new end
 		end
 	end
@@ -85,6 +153,7 @@ end
 
 -- Remove an ingredient from a recipe
 function util.remove_ingredient(recipe_name, old)
+  if bypass[recipe_name] then return end
   if data.raw.recipe[recipe_name] then
     remove_ingredient(data.raw.recipe[recipe_name], old)
     remove_ingredient(data.raw.recipe[recipe_name].normal, old)
@@ -110,17 +179,28 @@ end
 
 -- Replace an amount of an ingredient in a recipe. Keep at least 1 of old.
 function util.replace_some_ingredient(recipe_name, old, old_amount, new, new_amount)
-  replace_some_ingredient(data.raw.recipe[recipe_name], old, old_amount, new, new_amount)
-  replace_some_ingredient(data.raw.recipe[recipe_name].normal, old, old_amount, new, new_amount)
-  replace_some_ingredient(data.raw.recipe[recipe_name].expensive, old, old_amount, new, new_amount)
+  if bypass[recipe_name] then return end
+  if data.raw.recipe[recipe_name] then
+    replace_some_ingredient(data.raw.recipe[recipe_name], old, old_amount, new, new_amount)
+    replace_some_ingredient(data.raw.recipe[recipe_name].normal, old, old_amount, new, new_amount)
+    replace_some_ingredient(data.raw.recipe[recipe_name].expensive, old, old_amount, new, new_amount)
+  end
 end
 
 function replace_some_ingredient(recipe, old, old_amount, new, new_amount)
 	if recipe ~= nil and recipe.ingredients ~= nil then
+    for i, existing in pairs(recipe.ingredients) do
+      if existing[1] == new or existing.name == new then
+        log("Not adding "..new.." -- duplicate")
+        return
+      end
+    end
 		for i, ingredient in pairs(recipe.ingredients) do 
+			-- For final fixes
 			if ingredient.name == old then
         ingredient.amount = math.max(1, ingredient.amount - old_amount)
       end
+			-- For updates
 			if ingredient[1] == old then
         ingredient[2] = math.max(1, ingredient[2] - old_amount)
       end
@@ -129,30 +209,14 @@ function replace_some_ingredient(recipe, old, old_amount, new, new_amount)
 	end
 end
 
--- Add an effect to a given technology
-function util.add_effect(technology_name, effect)
-  technology = data.raw.technology[technology_name]
-  if technology then
-    table.insert(technology.effects, effect)
-  end
-end
-
--- check if a table contains a sought value
-function util.contains(table, sought)
-  for i, value in pairs(table) do
-    if value == sought then
-      return true
-    end
-  end
-  return false
-end
-
-
 -- multiply the cost, energy, and results of a recipe by a multiple
 function util.multiply_recipe(recipe_name, multiple)
-  multiply_recipe(data.raw.recipe[recipe_name], multiple)
-  multiply_recipe(data.raw.recipe[recipe_name].normal, multiple)
-  multiply_recipe(data.raw.recipe[recipe_name].expensive, multiple)
+  if bypass[recipe_name] then return end
+  if data.raw.recipe[recipe_name] then
+    multiply_recipe(data.raw.recipe[recipe_name], multiple)
+    multiply_recipe(data.raw.recipe[recipe_name].normal, multiple)
+    multiply_recipe(data.raw.recipe[recipe_name].expensive, multiple)
+	end
 end
 
 function multiply_recipe(recipe, multiple)
@@ -199,4 +263,14 @@ function multiply_recipe(recipe, multiple)
   end
 end
 
+-- Remove an element of type t and name from data.raw
+function util.remove_raw(t, name)
+  for i, elem in pairs(data.raw[t]) do
+    if elem.name == name then 
+      data.raw[t][i] = nil
+      break
+    end
+  end
+end
+
 return util