@KetanKumar I am also using the theme Impulse by Archetype and had the same issue we want resolved. I added the code you suggested and it worked but it ended up “also changing” my regular priced items (non-sale items) to be red as well and we want them to remain their original black color.
I don’t want any of my products not on sale to be affected by these code changes.
End goal is to have: Regular non-sale products have price that remains original black color and current sale items have the strike through price in grey with new sale price in red.
Let me know if you have a solution. Thank you in advance for your time, I appreciate any help I can get.