>>10947968also, pink board is an off slang term sometimes used on /b/, also saw term yellow board (but that was in accordance to antiporn) and beige board but it's just a faster way of saying "yotsuba board" just like blue board is a faster way of saying "yotsuba b board"
as all nsfw boards have a standard yotsuba theme (the pink beige/ pink yellow...pink creme? honestly the yellow tinted colour always reminded me of cum that didn't dry off but was also left for couple hours out there, like the rootber Jizzus used to ferment and scammed /b/-tards that it was cum)
and likewise all safe boards (which are presumably now under the 4channel domain) have a yotsuba b theme which is blue with a darker shade of blue (I heard it call teal but honestly teal to me falls more into the cyan than into the blue pallet)