Right after eggs are laid they have very thin veins that are more prominent on one side or the other. As time goes on, the veins seem to spread out and get thicker. If you're seeing vein development I think you're in the clearn. If, however, you see veins diminishing, your egg is dying. Either way, there's nothing you can do about it except provide the right temperature and humidity so they can thrive if thier destiny is to hatch.
Best wishes.
Python Joe

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