I am going to do a phenol:chloroform extraction. I stored the phenol:chloroform:IAA under -20 C degrees without realizing that the bottle says it should be stored between 2 - 8 C degrees. Some other products tell that storing under -20 degrees increases the shelf life. But it doesn't say so on this product. Do you think my phenol:chloroform:IAA is bad and unusable now that I stored it under -20 degrees?