Why did ammonium chloride fumes turned pink in this synthesis?
$\ce{NH3}$ and $\ce{SCl2}$ form $\ce{NH4Cl}$ which evolves as white fumes. $\ce{NH4Cl}$, when passed through $\ce{SCl2}$ (cherry-red liquid), gives the appearance of dense-pink fumes
$$\ce{\underset{(cherry red)}{6SCl2} + 16 NH3 -&gt; S4N4 +2S + \underset{(white)}{12NH4Cl}}$$
That is why the fumes of $\ce{NH4Cl}$ turned pink