This is my first year boiling and I have run into my first product question. I am boiling and I tasted a little of my syrup when I was pulling it off my pan. It had a slight sour taste on the back end. Is the sap/syrup bad? I am not selling it just boiling for myself this year. My sap is slightly yellow and slightly cloudy, not the best I know, but still smells fine. I just want to know if I should keep boiling my last 100 gal's or if I should end my season? Some help would be great. Thanks!!