  Our earlier put forward model of dark matter, consisting of cm-size pearls
with ordinary matter inside under high pressure and with a mass of order $1.4
*10^8$ kg, is used to explain the mysterious 3.5 keV X-ray line from the
galactic center and various galaxies and galaxy clusters. The pearls are
bubbles of a new type of vacuum and thus surrounded by a surface tension
providing the high pressure.
  We have two rather successful order of magnitude numerical results:
  1) the X-ray energy of 3.5 keV comes out as the homolumo-gap or rather as the
energy due to screening of electrons in the high pressure ordinary matter
inside the pearls, and is well fitted. %predicted correctly to within a factor
%{\bf tbc 2} %3; %$40 \%$;
  2) Using the fitting of Cline and Frey for dark matter radiation arising from
collisions or annihilations of dark matter particles we fit the overall
intensity of the radiation in our pearl model.
  We find that a pearl of the minimal size required just by stability, as used
in our previous work \cite{Tunguska}, is inconsistent with the observed
frequency and intensity of the 3.5 keV line. However the predictions of our
model are very sensitive to the radius of the pearls and an excellent fit to
both experimental quantities is obtained for a pearl of radius of 2.8 cm.
