Photo quality paper is quite expensive but worth it for good photographs you want to keep. I would recommend for more casual use the HP Premium Inkjet paper. It is a glossy finish and a fraction of the cost of the thicker photo papers.
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I use Glossy paper for normal prints, but I use Photo Quality Ink Jet Paper for pictures which are going into a frame. This paper gives good quality printouts at a fraction of the price and is good for framing. I recommend this procedure. No one knows what paper is behind the glass.