If your enlarger is spilling enough light for it to be reflected off the walls in sufficient quantity to affect your prints, the problem is the enlarger head, not the walls. Also, would like to re-emphasise Drew's comments about reflections off bits of the enlarger itself - parts of the lower section of floor standing DeVeres can reflect image spill, some black board & judicious use of the masking blades in the head/ carrier solve it pretty painlessly.
Having used grey & white easels, white is much easier to use - you can see the image for a start! Only problem is enlarging on to film & reflections bouncing off the baseboard - but a piece of black paper under the film solves that.
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