diff --git a/ClosedXML/Excel/Style/Colors/XLColor_Public.cs b/ClosedXML/Excel/Style/Colors/XLColor_Public.cs
index 7dcd8e4..9686902 100644
--- a/ClosedXML/Excel/Style/Colors/XLColor_Public.cs
+++ b/ClosedXML/Excel/Style/Colors/XLColor_Public.cs
@@ -28,6 +28,14 @@
 
     public partial class XLColor : IEquatable<XLColor>
     {
+        /// <summary>
+        /// Usually indexed colors are limited to max 63
+        /// Index 81 is some special case.
+        /// Some people claim it's the index for tooltip color.
+        /// We'll return normal black when index 81 is found.
+        /// </summary>
+        private const Int32 TOOLTIPCOLORINDEX = 81;
+
         private readonly XLColorType _colorType;
         private int _hashCode;
         private readonly Int32 _indexed;
@@ -50,7 +58,10 @@
                     throw new Exception("Cannot convert theme color to Color.");
 
                 if (_colorType == XLColorType.Indexed)
-                    return IndexedColors[_indexed].Color;
+                    if (_indexed == TOOLTIPCOLORINDEX)
+                        return Color.FromArgb(255, Color.Black);
+                    else
+                        return IndexedColors[_indexed].Color;
 
                 return _color;
             }
@@ -170,4 +181,4 @@
             return !(left == right);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/ClosedXML_Tests/ClosedXML_Tests.csproj b/ClosedXML_Tests/ClosedXML_Tests.csproj
index 1ad18c5..da93d14 100644
--- a/ClosedXML_Tests/ClosedXML_Tests.csproj
+++ b/ClosedXML_Tests/ClosedXML_Tests.csproj
@@ -77,6 +77,7 @@
     <Compile Include="Excel\CalcEngine\LookupTests.cs" />
     <Compile Include="Excel\CalcEngine\StatisticalTests.cs" />
     <Compile Include="Excel\CalcEngine\TextTests.cs" />
+    <Compile Include="Excel\Comments\CommentsTests.cs" />
     <Compile Include="Excel\Misc\XmlEncoderTests.cs" />
     <Compile Include="Excel\Loading\LoadingTests.cs" />
     <Compile Include="Excel\PageSetup\HeaderFooterTests.cs" />
@@ -256,6 +257,7 @@
     <EmbeddedResource Include="Resource\Examples\ConditionalFormatting\CFDataBar.xlsx" />
     <EmbeddedResource Include="Resource\Examples\ConditionalFormatting\CFIconSet.xlsx" />
     <EmbeddedResource Include="Resource\Examples\Ranges\SelectingRanges.xlsx" />
+    <EmbeddedResource Include="Resource\Misc\CommentsWithIndexedColor81.xlsx" />
     <EmbeddedResource Include="Resource\Misc\EmptyTable.xlsx" />
     <EmbeddedResource Include="Resource\Misc\FileWithDefaultStyleNameNotInEnglish.xlsx" />
     <EmbeddedResource Include="Resource\Misc\FileWithMismatchSheetIdAndRelId.xlsx" />
diff --git a/ClosedXML_Tests/Excel/Comments/CommentsTests.cs b/ClosedXML_Tests/Excel/Comments/CommentsTests.cs
new file mode 100644
index 0000000..1ba4e76
--- /dev/null
+++ b/ClosedXML_Tests/Excel/Comments/CommentsTests.cs
@@ -0,0 +1,33 @@
+using ClosedXML.Excel;
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ClosedXML_Tests.Excel.Comments
+{
+    public class CommentsTests
+    {
+        [Test]
+        public void CanGetColorFromIndex81()
+        {
+            using (var stream = TestHelper.GetStreamFromResource(TestHelper.GetResourcePath(@"Misc\CommentsWithIndexedColor81.xlsx")))
+            using (var wb = new XLWorkbook(stream))
+            {
+                var ws = wb.Worksheets.First();
+                var c = ws.FirstCellUsed();
+
+                var xlColor = c.Comment.Style.ColorsAndLines.LineColor;
+                Assert.AreEqual(XLColorType.Indexed, xlColor.ColorType);
+                Assert.AreEqual(81, xlColor.Indexed);
+
+
+                var color = xlColor.Color.ToHex();
+                Assert.AreEqual("FF000000", color);
+            }
+
+        }
+    }
+}
diff --git a/ClosedXML_Tests/Resource/Misc/CommentsWithIndexedColor81.xlsx b/ClosedXML_Tests/Resource/Misc/CommentsWithIndexedColor81.xlsx
new file mode 100644
index 0000000..715c073
--- /dev/null
+++ b/ClosedXML_Tests/Resource/Misc/CommentsWithIndexedColor81.xlsx
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