best coverage for deck with burn marks

I am undertaking refinishing my 20 year old 20X30 deck. The deck was black with dirt and mildew. I've started with powerwashing at 1500 psi with a wide angle tip with an oxygen bleach and citrus cleaning solution. The deck looks pretty good at this point except there is an area where I replaced a couple boards so there are two new pressure treated planks and it has some burn marks where someone had a fire pit on the deck (which is why I had to replace two plank because of a hole where the fire pit burned through).

So I am wondering two things- is there any product that may lighten up the burn marks ie a brighter? Will a semi transparnet stain in a dark color be enough to cover the burn marks and the new planks to blend together with the rest of the wood? Or will it be necessary to use a semi sold or solid which I don't prefer but that may be necessary.

Also I'm interested in green safe non toxic low VOC products. I have kids and dogs and plants.

Thanks for all the great info and advice on this site. Thanks in advance for any suggestions.

Catherine