The majority of framing I do is using museum quality matboards. I currently use regular Kraft paper for dust covers. Question: What companies offer a "acid free" buffered paper with a choice of at least 3 to chose from? The dust covers I put on frames only 5 years ago look absolutely terrible! I know black Kraft paper does hold it's color longer, but I am looking for a light color which would also be "acid free". Thanks...