diff --git a/kotlitex/src/main/java/io/github/karino2/kotlitex/view/MarkdownView.kt b/kotlitex/src/main/java/io/github/karino2/kotlitex/view/MarkdownView.kt
index 55569fc..df4aa4a 100644
--- a/kotlitex/src/main/java/io/github/karino2/kotlitex/view/MarkdownView.kt
+++ b/kotlitex/src/main/java/io/github/karino2/kotlitex/view/MarkdownView.kt
@@ -2,6 +2,7 @@ package io.github.karino2.kotlitex.view
 
 import android.content.Context
 import android.content.res.AssetManager
+import android.graphics.Color
 import android.text.Spannable
 import android.text.SpannableStringBuilder
 import android.util.AttributeSet
@@ -107,7 +108,7 @@ class SpannableMathSpanHandler(val assetManager: AssetManager, val baseSize: Flo
     private fun appendMathSpan(exp: String, isMathMode: Boolean) {
         isMathExist = true
         val size = if (isMathMode) mathExpressionSize else baseSize
-        val span = MathExpressionSpan(exp, size, assetManager, isMathMode)
+        val span = MathExpressionSpan(exp, size, assetManager, isMathMode, equationColor = Color.BLACK)
         span.ensureDrawable()
         val begin = spannable.length
         spannable.append("\$\$${exp}\$\$")
diff --git a/kotlitex/src/main/java/io/github/karino2/kotlitex/view/MathExpressionSpan.kt b/kotlitex/src/main/java/io/github/karino2/kotlitex/view/MathExpressionSpan.kt
index 29435c0..6fdd861 100644
--- a/kotlitex/src/main/java/io/github/karino2/kotlitex/view/MathExpressionSpan.kt
+++ b/kotlitex/src/main/java/io/github/karino2/kotlitex/view/MathExpressionSpan.kt
@@ -15,8 +15,9 @@ import kotlin.math.absoluteValue
 import kotlin.math.max
 import kotlin.math.roundToInt
 
-private class MathExpressionDrawable(expr: String, baseSize: Float, val fontLoader: FontLoader, val isMathMode: Boolean, val drawBounds: Boolean = false) {
+private class MathExpressionDrawable(expr: String, baseSize: Float, val fontLoader: FontLoader, val isMathMode: Boolean, val drawBounds: Boolean = false, equationColor: Int) {
     var rootNode: VerticalList
+    val colorEquation = equationColor
 
     val firstVListRowBound: Bounds?
     get() {
@@ -43,7 +44,7 @@ private class MathExpressionDrawable(expr: String, baseSize: Float, val fontLoad
 
     val paint = Paint()
     val textPaint = TextPaint(Paint.ANTI_ALIAS_FLAG).apply {
-        color = Color.BLACK
+        color = equationColor
         typeface = Typeface.SERIF
     }
 
@@ -117,7 +118,7 @@ private class MathExpressionDrawable(expr: String, baseSize: Float, val fontLoad
                 drawBounds(drawableSurface, parent.bounds)
             }
             is HorizontalLineNode -> {
-                paint.color = Color.BLACK
+                paint.color = colorEquation
                 paint.strokeWidth = max(1.0f, parent.bounds.height.toFloat())
                 val x = translateX(parent.bounds.x)
                 val y = translateY(parent.bounds.y)
@@ -156,7 +157,7 @@ private class MathExpressionDrawable(expr: String, baseSize: Float, val fontLoad
                 mat.postTranslate(x, y)
 
                 // TODO: more suitable handling.
-                paint.color = Color.BLACK
+                paint.color = colorEquation
                 paint.strokeWidth = 2.0f
                 paint.style = Paint.Style.FILL_AND_STROKE
 
@@ -222,7 +223,7 @@ private class MathExpressionDrawable(expr: String, baseSize: Float, val fontLoad
 @Suppress("UNUSED_PARAMETER")
 // Similar to DynamicDrawableSpan, but getSize is a little different.
 // I created super class of DynamicDrawableSpan because getCachedDrawable is private and we neet it.
-class MathExpressionSpan(val expr: String, val baseHeight: Float, val assetManager: AssetManager, val isMathMode: Boolean) : ReplacementSpan() {
+class MathExpressionSpan(val expr: String, val baseHeight: Float, val assetManager: AssetManager, val isMathMode: Boolean, val equationColor: Int) : ReplacementSpan() {
     enum class Align {
         Bottom, BaseLine
     }
@@ -365,7 +366,7 @@ class MathExpressionSpan(val expr: String, val baseHeight: Float, val assetManag
         // TODO: drawBounds should be always false. Unlike baseSize, we don't have to expose the flag to end-users.
         val drawable = MathExpressionDrawable(
             expr, baseHeight,
-            AndroidFontLoader(assetManager), isMathMode, drawBounds = false
+            AndroidFontLoader(assetManager), isMathMode, drawBounds = false, equationColor = equationColor
         )
         return drawable
     }