diff --git a/angelspetrochem/prototypes/recipes/petrochem-solids.lua b/angelspetrochem/prototypes/recipes/petrochem-solids.lua
index 9d20b9a2..62fb0d85 100644
--- a/angelspetrochem/prototypes/recipes/petrochem-solids.lua
+++ b/angelspetrochem/prototypes/recipes/petrochem-solids.lua
@@ -556,7 +556,8 @@ data:extend({
   {
     type = "recipe",
     name = "solid-trinitrotoluene",
-    category = "chemistry",
+	category = "advanced-chemistry", -- Aleksei-bird
+ --   category = "chemistry", -- Aleksei-bird
     subgroup = "petrochem-solids-2",
     energy_required = 2,
     enabled = false,