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We present an analysis of the results of long-term multi-band photometricmonitoring of the enigmatic star, KIC 8462852. Observations in the $B$, $g'$,$V$, $r'$ and $I_C$ passbands have been acquired at University College LondonObservatory (UCLO) between May 2017 and September 2018. We interrogate thewavelength dependence of the $\sim$month-long dimming and brightening exhibitedby the target star over an 85-day interval, immediately following a days-long$\sim5$ per cent drop in brightness on Julian Date (JD) 2458203. Between JD2458215--300 we measure brightness variations which correspond to relativeextinctions of $A_B/A_V = 1.39\pm0.27$, $A_{g'}/A_V = 1.16\pm0.11$, $A_{r'}/A_V= 0.80\pm0.25$ and $A_{Ic}/A_V = 0.49\pm0.19$, from which we infer anAngstr\"om absorption coefficient of $1.33\pm0.43$ ($R_V \simeq3.2^{+2.6}_{-1.0}$). As with the days-long `dips', the wavelength dependence ofthe longer-term brightness variations must also be associated with extinctionarising from a dust distribution containing a substantial fraction ofsub-micron-sized grains. This implies some common mechanism is responsible forthe star's variability over both these short and longer timescales.

Non-gray, Month-long Brightening of KIC 8462852 in the Immediate Aftermath of a Deep Dip