diff --git a/backend/library.c b/backend/library.c
index 849bb1f0..42e8cc6c 100644
--- a/backend/library.c
+++ b/backend/library.c
@@ -40,7 +40,6 @@
 #include "gs1.h"
 
 #define TECHNETIUM	"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%"
-#define TITANIUM "01234567890ABCDEFabcdef"
 
 struct zint_symbol *ZBarcode_Create() {
     struct zint_symbol *symbol;
@@ -1130,20 +1129,6 @@ int ZBarcode_Encode(struct zint_symbol *symbol, const unsigned char *source, int
         return ZINT_ERROR_INVALID_OPTION;
     }
     
-    //Check value of colours
-    if ((strlen(symbol->bgcolour) > 6) || (strlen(symbol->fgcolour) > 6)) {
-        strcpy(symbol->errtxt, "232: Invalid colour");
-        error_tag(symbol->errtxt, ZINT_ERROR_INVALID_OPTION);
-        return ZINT_ERROR_INVALID_OPTION;
-    }
-    
-    if ((is_sane(TITANIUM, (unsigned char *)symbol->bgcolour, strlen(symbol->bgcolour)) == ZINT_ERROR_INVALID_DATA) 
-        || (is_sane(TITANIUM, (unsigned char *)symbol->fgcolour, strlen(symbol->bgcolour)) == ZINT_ERROR_INVALID_DATA)) {
-        strcpy(symbol->errtxt, "233: Invalid characters in colour");
-        error_tag(symbol->errtxt, ZINT_ERROR_INVALID_OPTION);
-        return ZINT_ERROR_INVALID_OPTION;
-    }
-    
     switch (symbol->symbology) {
         case BARCODE_QRCODE:
         case BARCODE_MICROQR:
@@ -1286,11 +1271,6 @@ int ZBarcode_Print(struct zint_symbol *symbol, int rotate_angle) {
         return ZINT_ERROR_INVALID_OPTION;
     }
 
-    if (error_number == ZINT_ERROR_INVALID_OPTION) {
-        /* If libpng is not installed */
-        strcpy(symbol->errtxt, "227: No PNG support - compile with libpng-devel to resolve");
-    }
-
     error_tag(symbol->errtxt, error_number);
     return error_number;
 }