My Glowforge will not engrave on a black paper bag

[evansd2]

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Lasered Black Paper bags

I apologize if someone has already talked about this. I found a wonderful tutorial on youtube about laser engraving black bags. I ended up tweaking some settings to work for my glowforge pro. I feel like this is a cost saving thing for someone just starting out who doesn’t want to spend more money on supplies or printing beyond just the bags. The ones with black handle I got at Hobby Lobby. Those have a white inside. The ones with the Kraft paper color are from Amazon. Just regular gift bags b…