Ill. Admin. Code tit. 23, § 3300.60
a) The borrower shall insure the object at the value stated by the DMAIL, which shall be determined in one of the following ways:
3) Comparison to similar artifact whose value has been determined by an appraiser or restorer (e.g., two Civil War battle flags).
The insurance shall be in force from the time the object leaves the physical possession of the DMAIL until returned.
The following insurance requirements must be met: