It's not a big deal since the other 13 plants have sprouted with a nice green color, but this one was born yellow, cotyledons and all. My soil could be the problem since I have been reusing it for some time, but I don't understand why this doesn't happen with the other 13 seedlings. I am using biobizz light mix. Is it because this particular plant has a defect, or could there be any other causes as to why this happens? She looks healthy otherwise.
If its leaves started growing while it was still underground the lack of light would cause that. It should green up in a day or so
if it only the one it could be a bad bean. It may continue jus check the growth if it still growing. Check the new growth if its green. nurture her.