Yellow concrete tape works well for my purposes. The ledge on the bottom rung of my concrete back stair clearly stands out. The tape didn't stick well at first. Possibly because I didn't clean the step well before applying the tape. However, I didn't have to pick it up. I just kept squeezing it with my foot while running and now it sticks well to the concrete. This tape helps my old eyes a lot. This bottom step is now the step I cannot skip.
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