US 9,660,311 B2  51  52  a phenol represented by the general formula  wherein R$^{1}$-R 5  are an aliphatic or aromatic optionally  substituted organic radical;  an aminium salt;  an amphoteric hydroxide;  a polyprotic organic acid; and  an organic acid having a vapor pressure less than that of  acetic acid.  *  *  *  *  * 