the echo around $\tau_n=nT$, $A(\tau_n) = \int({g^{(2)}}_m(q,\tau)-1)d\tau$. The DSF was then obtained from corrected ICF in the usual way from Eq. \[eq:DSF\].

We used echo DLS to measure dynamics in the range $\tau=1-10^4$ seconds. Since the rotation used introduces slightly different alignment in the DLS setup (hence different $\beta^2$), the resulting intercepts are different from those obtained by brute-force ensemble averaging. Therefore we scaled the intercept of the echo DLS results by an arbitrary factor (in the range of 1–2) so that the resulting DSF from both methods matched in the region of overlap.

Results and discussion
======================

Phase diagram
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The equilibrium phase diagrams of colloid-polymer mixtures at different values of $\xi$ are well known [@cpphaseexpt]. The non-equilibrium behavior of systems with $\xi \approx 0.1$ at low volume fractions ($\phi<0.2$) has been studied before [@lowPhiCP1; @lowPhiCP2]. Here we concentrate on the higher volume fraction region ($\phi\ge0.3$).

Many samples were prepared in a range of compositions of interest. After being homogenized by prolonged tumbling, samples were left undisturbed for observation. Because the sizes of colloidal particles are similar to wavelengths of visible light, colloidal crystals can be seen with the naked eye as iridescent specks.

Our observations are shown in 