CREATE TABLE table_67234 ("Polyphenyl Ether" TEXT, "Appearance" TEXT, "Thermal Stability \\u00b0F  ( \\u00b0C ) " TEXT, "Viscosity  ( cSt )  at 100\\u00b0F  ( 38\\u00b0C ) " FLOAT, "Viscosity  ( cSt )  at 210\\u00b0F  ( 99\\u00b0C ) " FLOAT)

What does Polyphenyl Ether of 3- and 4-ring oxythio look like?
SELECT "Appearance" FROM table_67234 WHERE "Polyphenyl Ether" = '3- and 4-ring oxythio'
SELECT "Appearance" FROM "table_67234" WHERE "Polyphenyl Ether" = '3- and 4-ring oxythio'