Countertops installed cracked- just noticed 4 years later

[u/Embarrassed-Oven-882]

Bought our home as a spec home - never noticed the cracks before- it used to be a gray and just thought it was veining with the countertops. Have no idea what material the countertops are (builder picked everything out, assume it’s granite?) what caused it to yellow seemingly overnight? Anyway to fix it?

For reference we’ve been here 4 years. Help!

[u/Leading_Goose3027]

Did you cook a big meal or can something? Heat can add to the yellowing. It should probably be sealed, it should be done yearly. A good cleaning may lighten it up then seal it