I've missed a few episodes but when Lucretia is with Ilythia her hair is Blonde and when she is with Batiatus her hair is red. Why does she switch her hair color? Does anyone know?
Answer on In Spartacus: Blood and Sand, Why is Lucretia's hair Blond and sometimes Red?
The blonde hair is actually a wig that she wears when she is around Ilithyia. It serves as the same purpose as the emerald necklace that she bought. Lucretia and Batiatus are trying to climb up the social ladder so Lucretia tries to impress Ilithyia to get in with her and her family (Senator Albinius).
Hope this helps somewhat.