org.apache.poi.hssf.converter.AbstractExcelUtils.getColor(HSSFColor)

#0e3466 will be converted to #e3466

The part of code:
for (short s : color.getTriplet()) {
    if (s < 10) {
        stringBuilder.append('0');
    }
        stringBuilder.append(Integer.toHexString(s));
    }
}

And I think that:
's < 10' should be 's < 16'