  We use the photometric metallicities provided by the panoramic Pristine
survey to study the veracity and derive the metallicities of the numerous
stellar streams found by the application of the STREAMFINDER algorithm to the
Gaia EDR3 data. All 26 streams present in Pristine show a clear metallicity
distribution function, which provides an independent check of the reality of
these structures, supporting the reliability of STREAMFINDER in finding streams
and the power of Pristine to measure precise metallicities. We further present
6 candidate structures with coherent phase-space and metallicity signals that
are very likely streams. The majority of studied streams are very metal-poor
(14 structures with [Fe/H]<-2.0) and include 3 systems with [Fe/H]<-2.9 (C-11,
C-19, and C-20). These streams could be the closest debris of low-luminosity
dwarf galaxies or may have originated from globular clusters of significantly
lower metallicity than any known current Milky Way globular cluster. Our study
shows that the promise of the Gaia data for Galactic Archeology studies can be
substantially strengthened by quality photometric metallicities, allowing us to
peer back into the earliest epochs of the formation of our Galaxy and its
stellar halo constituents.
