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The extinction law from $0.9$ to $8$ microns in the inner $3\times3$ deg$^2$of the Milky Way is measured using data from VISTA Variables in the Via Lactea,GLIMPSE and WISE. Absolute extinction ratios are found by requiring that theobserved red clump density peaks at the GRAVITY collaboration distance to theGalactic centre. When combined with selective extinction ratios measured fromthe bulge giant colour-colour diagrams, we find an extinction law of$A_Z:A_Y:A_J:A_H:A_{K_s}:A_{W1}:A_{[3.6]}:A_{[4.5]}:A_{W2}:A_{[5.8]}:A_{[8.0]}=7.19(0.30):5.11(0.20):3.23(0.11):1.77(0.04):1:0.54(0.02):0.46(0.03):0.34(0.03):0.32(0.03):0.24(0.04):0.28(0.03)$valid for low extinctions where non-linearities are unimportant. These resultsimply an extinction law from the Rayleigh Jeans colour excess method (RJCE) of$A_{K_s}=0.677(H-[4.5]-0.188)$. We find little evidence for significantselective extinction ratio variation over the inspected region (around $5\%$).Assuming the absolute extinction ratios do not vary across the inspected regiongives an independent measurement of the absolute $K_s$ magnitude of the redclump at the Galactic Centre of $(-1.61\pm0.07)\,\mathrm{mag}$. This is verysimilar to the value measured for solar neighbourhood red clump stars givingconfidence in the use of red clump stars as standard candles across the Galaxy.As part of our analysis, we inspect the completeness of PSF photometry from theVVV survey using artificial star tests, finding $90\%$ completeness at$K_s\approx16 \,(17)$ in high (low) density regions and good agreement with thenumber counts with respect to the GALACTICNUCLEUS and DECAPS catalogues oversmall regions of the survey.

The extinction law in the inner $3\times3$ deg$^2$ of the Milky Way and the red clump absolute magnitude in the inner bar-bulge