IMO! When you get the chain hot enough that it turns blue, “You Have Lost Temper In The Metal”. I doubt it will hold a good edge long. A friend experienced something similar w/o getting the metal blue. His fair Stihl chain stopped holding an edge after he sharpened it “Many” times with the Dremel Type Sharpener. I could not find a good documentation related but the Brand’s Company will probably supply this info.

We purchased the Dremel Type Sharpener from Sears in 1984 after seeing we were going broke on getting chains sharpened. After our mid 70s start and cutting lots of Dozed wood with sand Etc in the wood eating bars and chains. My goal was to get two cords to feel it was worth the loss. Plus, I noticed my chain lasted longer “sharpening it vs the Small Engine Shops 2-3 sharpening (due to what they took off each sharpening).

I went to Carbide tip Bars vs Sprockets due to grit and making my chains from Flea Market Chains and Chain Stock. A closing dealer sold /gave me links Etc to make chains that will last past my needs. My saws have been happy! I have gone to Electric Saws basically with the same 16” Bars/Chains or their 12” – 14” Etc cutting at home only. Tree Trimmers will load you in this Over Grown “Old” Neighborhood. Red Oak, Live Oak, Pecan and Ash Firewood are coming from blocks/houses away the last 10 years vs miles mid 70s-90s.

Once the chain is filed so that the blue disappears it should be fine.

Try and post close clear pictures with the chain straight. Showing the bluing on “Some Teeth” from top, inside and outside to show some worthwhile teeth will be left past the bluing.

Get the Owner/Manager opinion on the bluing. This could have been a beginner’s mistake that they will have no problem replacing. Waiting to see the results could be timely and a Total Loss. IMO, if they have experience with this matter they will work with you.

I'd check all the teeth and make sure none were sharpened down to a nub (almost nothing). If they're all ok, I'd use the chain and find someone else to sharpen in the future. If you find any teeth that have been over-ground, you should ask for a replacement.

I start with a fresh chain every time I use the saws. I used to get them sharpened, Then, I bought a hand filing jig. For the last 25 yrs or so , I just clamp the bar in the vise and hit it with a file. Every 3rd time, I knock off the rakers.