You're asking for the viscosity of ferric chloride, but it's important to understand that ferric chloride ($FeCl_3$) is a solid at room temperature. It doesn't have a viscosity in the same way that liquids do.

However, you might be interested in the viscosity of a solution of ferric chloride. In that case, the viscosity will depend on several factors:

* Concentration of the solution: Higher concentrations will generally lead to higher viscosity.

* Temperature: Viscosity decreases as temperature increases.

* Presence of other solutes: Adding other substances to the solution can affect the viscosity.

To find the viscosity of a specific solution of ferric chloride, you would need to look up the data in a reference source or perform experiments to determine it.

Let me know if you have more questions!