diff --git a/phpBB/config/default/container/services_text_formatter.yml b/phpBB/config/default/container/services_text_formatter.yml
index df24d9a080..119e0b2ba4 100644
--- a/phpBB/config/default/container/services_text_formatter.yml
+++ b/phpBB/config/default/container/services_text_formatter.yml
@@ -55,6 +55,7 @@ services:
     text_formatter.s9e.mention_helper:
         class: phpbb\textformatter\s9e\mention_helper
         arguments:
+            - '@dbal.conn'
             - '%core.root_path%'
             - '%core.php_ext%'
 
diff --git a/phpBB/phpbb/textformatter/s9e/mention_helper.php b/phpBB/phpbb/textformatter/s9e/mention_helper.php
index 4f19a9dc5f..96bc896bad 100644
--- a/phpBB/phpbb/textformatter/s9e/mention_helper.php
+++ b/phpBB/phpbb/textformatter/s9e/mention_helper.php
@@ -13,8 +13,15 @@
 
 namespace phpbb\textformatter\s9e;
 
+use s9e\TextFormatter\Utils;
+
 class mention_helper
 {
+	/**
+	* @var \phpbb\db\driver\driver_interface
+	*/
+	protected $db;
+
 	/**
 	* @var string Base URL for a user profile link, uses {USER_ID} as placeholder
 	*/
@@ -25,18 +32,74 @@ class mention_helper
 	*/
 	protected $group_profile_url;
 
+	/**
+	* @var array Array of users' and groups' colors for each cached ID
+	*/
+	protected $cached_colors = [];
+
 	/**
 	* Constructor
 	*
+	* @param \phpbb\db\driver\driver_interface $db
 	* @param string $root_path
 	* @param string $php_ext
 	*/
-	public function __construct($root_path, $php_ext)
+	public function __construct($db, $root_path, $php_ext)
 	{
+		$this->db = $db;
 		$this->user_profile_url = append_sid($root_path . 'memberlist.' . $php_ext, 'mode=viewprofile&u={USER_ID}', false);
 		$this->group_profile_url = append_sid($root_path . 'memberlist.' . $php_ext, 'mode=group&g={GROUP_ID}', false);
 	}
 
+	/**
+	 * Caches colors for specified user IDs and group IDs
+	 *
+	 * @param array $user_ids
+	 * @param array $group_ids
+	 */
+	protected function get_colors($user_ids, $group_ids)
+	{
+		$this->cached_colors = [];
+		$this->cached_colors['users'] = [];
+		$this->cached_colors['groups'] = [];
+
+		if (!empty($user_ids))
+		{
+			$query = $this->db->sql_build_query('SELECT', [
+				'SELECT' => 'u.user_colour, u.user_id',
+				'FROM'   => [
+					USERS_TABLE => 'u',
+				],
+				'WHERE'  => 'u.user_id <> ' . ANONYMOUS . '
+				AND ' . $this->db->sql_in_set('u.user_type', [USER_NORMAL, USER_FOUNDER]) . '
+				AND ' . $this->db->sql_in_set('u.user_id', $user_ids),
+			]);
+			$res = $this->db->sql_query($query);
+
+			while ($row = $this->db->sql_fetchrow($res))
+			{
+				$this->cached_colors['users'][$row['user_id']] = $row['user_colour'];
+			}
+		}
+
+		if (!empty($group_ids))
+		{
+			$query = $this->db->sql_build_query('SELECT', [
+				'SELECT' => 'g.group_colour, g.group_id',
+				'FROM'   => [
+					GROUPS_TABLE => 'g',
+				],
+				'WHERE'  => $this->db->sql_in_set('g.group_id', $group_ids),
+			]);
+			$res = $this->db->sql_query($query);
+
+			while ($row = $this->db->sql_fetchrow($res))
+			{
+				$this->cached_colors['groups'][$row['group_id']] = $row['group_colour'];
+			}
+		}
+	}
+
 	/**
 	* Inject dynamic metadata into MENTION tags in given XML
 	*
@@ -48,7 +111,13 @@ class mention_helper
 		$user_profile_url = $this->user_profile_url;
 		$group_profile_url = $this->group_profile_url;
 
-		return \s9e\TextFormatter\Utils::replaceAttributes(
+		// TODO: think about optimization for caching colors.
+		$this->get_colors(
+			Utils::getAttributeValues($xml, 'MENTION', 'user_id'),
+			Utils::getAttributeValues($xml, 'MENTION', 'group_id')
+		);
+
+		return Utils::replaceAttributes(
 			$xml,
 			'MENTION',
 			function ($attributes) use ($user_profile_url, $group_profile_url)
@@ -56,10 +125,20 @@ class mention_helper
 				if (isset($attributes['user_id']))
 				{
 					$attributes['profile_url'] = str_replace('{USER_ID}', $attributes['user_id'], $user_profile_url);
+
+					if (isset($this->cached_colors['users'][$attributes['user_id']]))
+					{
+						$attributes['color'] = $this->cached_colors['users'][$attributes['user_id']];
+					}
 				}
 				else if (isset($attributes['group_id']))
 				{
 					$attributes['profile_url'] = str_replace('{GROUP_ID}', $attributes['group_id'], $group_profile_url);
+
+					if (isset($this->cached_colors['groups'][$attributes['group_id']]))
+					{
+						$attributes['color'] = $this->cached_colors['groups'][$attributes['group_id']];
+					}
 				}
 
 				return $attributes;
diff --git a/phpBB/styles/prosilver/template/bbcode.html b/phpBB/styles/prosilver/template/bbcode.html
index 71e8d2b0d2..8ee7351486 100644
--- a/phpBB/styles/prosilver/template/bbcode.html
+++ b/phpBB/styles/prosilver/template/bbcode.html
@@ -9,15 +9,19 @@
 <!-- BEGIN listitem_close --></li><!-- END listitem_close -->
 
 <!-- BEGIN mention -->
+<xsl:text>@</xsl:text>
 <xsl:choose>
 	<xsl:when test="@profile_url">
-		<a>
+		<a class="mention">
 			<xsl:attribute name="href"><xsl:value-of select="@profile_url"/></xsl:attribute>
+			<xsl:if test="@color">
+				<xsl:attribute name="style">color: #<xsl:value-of select="@color"/>;</xsl:attribute>
+			</xsl:if>
 			<xsl:apply-templates/>
 		</a>
 	</xsl:when>
 	<xsl:otherwise>
-		<span>
+		<span class="mention">
 			<xsl:apply-templates/>
 		</span>
 	</xsl:otherwise>
diff --git a/phpBB/styles/prosilver/theme/content.css b/phpBB/styles/prosilver/theme/content.css
index 338016ac2c..701fa5fd94 100644
--- a/phpBB/styles/prosilver/theme/content.css
+++ b/phpBB/styles/prosilver/theme/content.css
@@ -576,6 +576,11 @@ blockquote .codebox {
 	padding: 5px 3px;
 }
 
+/* Mention block */
+.mention {
+	font-weight: bold;
+}
+
 /* Attachments
 ---------------------------------------- */
 .attachbox {