  We notice that looking for $\nu_e \to \nu_\tau$ at the same time as $\nu_e
\to \nu_\mu$ oscillations could significantly help to reduce the errors in the
leptonic CP-violating phase $\delta$ measurement. We show how the $\nu_e \to
\nu_\mu$ (``golden'') and $\nu_e \to \nu_\tau$ (``silver'') transitions
observed at an OPERA-like 2 Kton lead-emulsion detector at L = 732 Km, in
combination with the $\nu_e \to \nu_\mu$ transitions observed at a 40 Kton
magnetized iron detector with a baseline of L = 3000 Km, strongly reduce the
so-called $(\theta_{13}, \delta)$ ambiguity. We also show how a moderate
increase in the OPERA-like detector mass (4 Kton instead of 2 Kton) completely
eliminates the clone regions even for small values of $\theta_{13}$.
