diff --git a/klausur-service/backend/grid_editor_api.py b/klausur-service/backend/grid_editor_api.py
index 3523964..9787053 100644
--- a/klausur-service/backend/grid_editor_api.py
+++ b/klausur-service/backend/grid_editor_api.py
@@ -2292,7 +2292,7 @@ async def _build_grid_core(session_id: str, session: dict) -> dict:
     # OCR reads these as text artifacts (©, e, *, or even plausible words
     # like "fighily" overlapping the real word "tightly").
     # Detection rules:
-    #   a) Tiny blue symbols: area < 150 AND conf < 85
+    #   a) Tiny coloured symbols: area < 200 AND conf < 85 (any non-black)
     #   b) Overlapping word_boxes: >40% x-overlap → remove lower confidence
     #   c) Duplicate text: consecutive blue wbs with identical text, gap < 6px
     bullet_removed = 0
@@ -2303,10 +2303,11 @@ async def _build_grid_core(session_id: str, session: dict) -> dict:
                 continue
             to_remove: set = set()
 
-            # Rule (a): tiny blue symbols
+            # Rule (a): tiny coloured symbols (bullets, graphic fragments)
             for i, wb in enumerate(wbs):
-                if (wb.get("color_name") == "blue"
-                        and wb.get("width", 0) * wb.get("height", 0) < 150
+                cn = wb.get("color_name", "black")
+                if (cn != "black"
+                        and wb.get("width", 0) * wb.get("height", 0) < 200
                         and wb.get("conf", 100) < 85):
                     to_remove.add(i)