diff --git a/scripts/build_chemistry_catalog.py b/scripts/build_chemistry_catalog.py
index 5ebf5dd..5679296 100644
--- a/scripts/build_chemistry_catalog.py
+++ b/scripts/build_chemistry_catalog.py
@@ -9,31 +9,7 @@
 
 import yaml
 
-
-class GameYamlLoader(yaml.SafeLoader):
-    """YAML loader that accepts SS14 custom tags."""
-
-
-def construct_tagged_value(
-    loader: GameYamlLoader,
-    tag_suffix: str,
-    node: yaml.Node,
-) -> Any:
-    if isinstance(node, yaml.MappingNode):
-        value = loader.construct_mapping(node, deep=True)
-    elif isinstance(node, yaml.SequenceNode):
-        value = loader.construct_sequence(node, deep=True)
-    else:
-        value = loader.construct_scalar(node)
-
-    return {
-        "yamlTag": f"!{tag_suffix}",
-        "value": value,
-    }
-
-
-GameYamlLoader.add_multi_constructor("!", construct_tagged_value)
-
+from chemistry_yaml import GameYamlLoader, normalize_parents
 
 FTL_MESSAGE_RE = re.compile(
     r"^([A-Za-z0-9][A-Za-z0-9_-]*)\s*=\s*(.*)$"
@@ -154,14 +130,6 @@ def read_chemical_group_sections(
     return guide_path, group_sections
 
 
-def normalize_parents(value: Any) -> list[str]:
-    if isinstance(value, str):
-        return [value]
-    if isinstance(value, list):
-        return [item for item in value if isinstance(item, str)]
-    return []
-
-
 def read_upstream_reagents(game_source: Path) -> dict[str, dict[str, Any]]:
     root = game_source / "Resources/Prototypes/Reagents"
     if not root.is_dir():
diff --git a/scripts/chemistry_yaml.py b/scripts/chemistry_yaml.py
new file mode 100644
index 0000000..d178b0f
--- /dev/null
+++ b/scripts/chemistry_yaml.py
@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from typing import Any
+
+import yaml
+
+
+class GameYamlLoader(yaml.SafeLoader):
+    """YAML loader that accepts and preserves SS14 custom tags."""
+
+
+def construct_tagged_value(
+    loader: GameYamlLoader,
+    tag_suffix: str,
+    node: yaml.Node,
+) -> Any:
+    if isinstance(node, yaml.MappingNode):
+        value = loader.construct_mapping(node, deep=True)
+    elif isinstance(node, yaml.SequenceNode):
+        value = loader.construct_sequence(node, deep=True)
+    else:
+        value = loader.construct_scalar(node)
+
+    return {
+        "yamlTag": f"!{tag_suffix}",
+        "value": value,
+    }
+
+
+GameYamlLoader.add_multi_constructor("!", construct_tagged_value)
+
+
+def normalize_parents(value: Any) -> list[str]:
+    if isinstance(value, str):
+        return [value]
+    if isinstance(value, list):
+        return [item for item in value if isinstance(item, str)]
+    return []
diff --git a/scripts/index_chemistry.py b/scripts/index_chemistry.py
index 2f096c5..203c8e5 100644
--- a/scripts/index_chemistry.py
+++ b/scripts/index_chemistry.py
@@ -8,40 +8,7 @@
 
 import yaml
 
-
-class GameYamlLoader(yaml.SafeLoader):
-    """YAML loader that accepts and preserves SS14 custom tags."""
-
-
-def construct_tagged_value(
-    loader: GameYamlLoader,
-    tag_suffix: str,
-    node: yaml.Node,
-) -> Any:
-    if isinstance(node, yaml.MappingNode):
-        value = loader.construct_mapping(
-            node,
-            deep=True,
-        )
-    elif isinstance(node, yaml.SequenceNode):
-        value = loader.construct_sequence(
-            node,
-            deep=True,
-        )
-    else:
-        value = loader.construct_scalar(node)
-
-    return {
-        "yamlTag": f"!{tag_suffix}",
-        "value": value,
-    }
-
-
-GameYamlLoader.add_multi_constructor(
-    "!",
-    construct_tagged_value,
-)
-
+from chemistry_yaml import GameYamlLoader, normalize_parents
 
 SOURCE_ROOTS = [
     {
@@ -67,20 +34,6 @@ def construct_tagged_value(
 ]
 
 
-def normalize_parents(value: Any) -> list[str]:
-    if isinstance(value, str):
-        return [value]
-
-    if isinstance(value, list):
-        return [
-            item
-            for item in value
-            if isinstance(item, str)
-        ]
-
-    return []
-
-
 def read_file(
     game_source: Path,
     path: Path,