Litmus, Anleth.

I recently ran once more into the tangle drasvi recorded here; litmus is: From Middle English litmose, lytmose, litemose, from Old Norse litmosi (“moss used for dyeing”), from lita (“to dye, stain”), from litr (“colour, dye, blee”), from Proto-Germanic *wlitiz, *wlituz (“appearance, blee”), from Proto-Indo-European *wel- (“to see”) + mosi (“moss”). Cognate with Old English wlite (“appearance, form, brightness, countenance”). And Dutch lakmoes is: From Middle Dutch lecmoes (1252), Middle Dutch lijcmoes (1459), early modern Dutch leeckmoes (1514), modern Dutch lackmoes (ca. 1620 and 1679).[1][2][3] Equivalent to lekken +‎ moes, the first element was later adapted by folk etymology to lak. Likely related to Old Norse litmosi, but the details of how they are related remain unclear. I followed the trail in the OED from litmus, “Altered from Middle Dutch leecmos, lijcmoes (modern Dutch lakmoes) lacmus n., probably from association with lit v.,” to lit ‘To colour, dye; to stain’ “< Old Norse…