diff -r 023ca640b5af -r 1365b5e47130 www/js/global.js
--- a/www/js/global.js	Mon May 13 12:50:24 2019 +0200
+++ b/www/js/global.js	Mon May 13 16:26:28 2019 +0200
@@ -294,9 +294,10 @@
 var IBUmethodAdapter = new $.jqx.dataAdapter(IBUmethodSource);
 
 var ColorMethodData = [
-	{ id: 0, en: 'Morey',   nl: 'Morey' },
-	{ id: 1, en: 'Mosher',  nl: 'Mosher' },
-	{ id: 2, en: 'Daniels', nl: 'Daniels' }
+	{ id: 0, en: 'Morey',       nl: 'Morey' },
+	{ id: 1, en: 'Mosher',      nl: 'Mosher' },
+	{ id: 2, en: 'Daniels',     nl: 'Daniels' },
+	{ id: 3, en: 'Halberstadt', nl: 'Halberstadt' }
 ];
 var ColorMethodSource = {
 	localdata: ColorMethodData,
@@ -735,6 +736,36 @@
 
 
 /*
+ * Return incremented color by the boil and yeast.
+ * https://www.hobbybrouwen.nl/forum/index.php/topic,19020.msg281132.html#msg281132
+ */
+function get_kt(ebc) {
+
+	var kt = 1;
+	if (ebc < 3)
+		kt = 3.5;
+	else if (ebc < 6)
+		kt = 3;
+	else if (ebc < 8)
+		kt = 2.75;
+	else if (ebc < 10)
+		kt = 2.5;
+	else if (ebc < 20)
+		kt = 1.8;
+	else if (ebc < 30)
+		kt = 1.6;
+	else if (ebc < 60)
+		kt = 1.3;
+	else if (ebc < 100)
+		kt = 1.2;
+	else if (ebc < 300)
+		kt = 1.1;
+	return kt;
+}
+
+
+
+/*
  * Alcohol By Volume
  */
 function abvol(og, fg) {
@@ -768,7 +799,7 @@
 
 
 /*
- * Kleurwerking naar SRM
+ * Kleurwerking naar SRM. Niet voor Halberstadt.
  */
 function kw_to_srm(colormethod, c) {
 
@@ -778,6 +809,8 @@
 		return 0.3 * c + 4.7;
 	if (colormethod == 2)	// Daniels
 		return 0.2 * c + 8.4;
+	if (colormethod == 3)	// Halberstadt
+		return 0;
 }