diff --git a/inventoryManager.lua b/inventoryManager.lua
index 52c3aac..52a688f 100644
--- a/inventoryManager.lua
+++ b/inventoryManager.lua
@@ -57,14 +57,14 @@ local SMELTABLE = {
     ["minecraft:deepslate_gold_ore"]   = { result = "minecraft:gold_ingot",     furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
     ["minecraft:deepslate_copper_ore"] = { result = "minecraft:copper_ingot",   furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
     ["minecraft:ancient_debris"]       = { result = "minecraft:netherite_scrap",furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
-    -- Sand / stone (furnace + blast furnace)
-    ["minecraft:sand"]           = { result = "minecraft:glass",            furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
-    ["minecraft:red_sand"]       = { result = "minecraft:glass",            furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
-    ["minecraft:cobblestone"]    = { result = "minecraft:stone",            furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
-    ["minecraft:stone"]          = { result = "minecraft:smooth_stone",     furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
-    ["minecraft:clay_ball"]      = { result = "minecraft:brick",            furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
-    ["minecraft:netherrack"]     = { result = "minecraft:nether_brick",     furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
-    ["minecraft:sandstone"]      = { result = "minecraft:smooth_sandstone", furnaces = {"minecraft:furnace", "minecraft:blast_furnace"} },
+    -- Sand / stone / clay (regular furnace only — blast furnace rejects these)
+    ["minecraft:sand"]           = { result = "minecraft:glass",            furnaces = {"minecraft:furnace"} },
+    ["minecraft:red_sand"]       = { result = "minecraft:glass",            furnaces = {"minecraft:furnace"} },
+    ["minecraft:cobblestone"]    = { result = "minecraft:stone",            furnaces = {"minecraft:furnace"} },
+    ["minecraft:stone"]          = { result = "minecraft:smooth_stone",     furnaces = {"minecraft:furnace"} },
+    ["minecraft:clay_ball"]      = { result = "minecraft:brick",            furnaces = {"minecraft:furnace"} },
+    ["minecraft:netherrack"]     = { result = "minecraft:nether_brick",     furnaces = {"minecraft:furnace"} },
+    ["minecraft:sandstone"]      = { result = "minecraft:smooth_sandstone", furnaces = {"minecraft:furnace"} },
     -- Food (furnace + smoker only)
     ["minecraft:beef"]           = { result = "minecraft:cooked_beef",      furnaces = {"minecraft:furnace", "minecraft:smoker"} },
     ["minecraft:porkchop"]       = { result = "minecraft:cooked_porkchop",  furnaces = {"minecraft:furnace", "minecraft:smoker"} },