Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What does Polyphenyl Ether of 3- and 4-ring oxythio look like?

### Inputs:
table_name: table, columns: ['Polyphenyl Ether', 'Appearance', 'Thermal Stability °F (°C)', 'Viscosity (cSt) at 100°F (38°C)', 'Viscosity (cSt) at 210°F (99°C)']

### Response:
SELECT Appearance FROM table WHERE Polyphenyl Ether = 3- and 4-ring oxythio