Rachel Dolezal ADMITS SHE'S WHITE

Rachel Dolezal may be telling the world in her mind she's been black since age 5, but at age 27, she said squarely ... she's Caucasian.

TMZ obtained legal docs in Rachel's 2005 custody war with her ex-husband. Rachel claims Kevin Moore struck their son Franklin, saying in her affidavit, "I noticed a bruise on Franklin's left eye after he returned from visitation with [Kevin]," adding, "Franklin is a child of blended ethnic decent [sic], and bruises are less noticeable on his dark skin than on that of a Caucasian child."

The key is the phrase, "blended ethnic decent [sic]." Kevin is unquestionably black. So, she's admitting she's white because the child is blended.

It's in stark contrast to Rachel's claim Tuesday, "I definitely am not white."