After working with some cyanotypes over palladium I want a little more control and more color options so gum here I come. I'm not worried about the brushes and pigments as we have many art stores locally here in the Dallas/Fort Worth area, but the chemicals are a little bit more troublesome. I figure there are only 3 things I need to get: 250 bloom gelatine ammonium dichromate 40% glyoxal solution I might be able to find the gelatin in the area, a source may have already been found for the ammonium dichromate, and Bostick & Sullivan has the glyoxal already in 40% solution (after looking at some of the health issues I don't want to deal with it in powder). Does anyone have some suggestions in the amount to order for my first time? I was thinking 250g of ammonium dichromate, 250mL of the 40% glyoxal solution, and 500-1000g of gelatine to keep the costs lower for this first order (want to make sure I like the results before stocking up). As for paper, I know Clay recommends Whatman's, but I have a lot of stonehenge rising around--has anyone use it for gum and/or gum over palladium? Finally, I read in John Carroll's Photographic Facts and Formulas (1976 edition) that: "The paper may also be sized with a fairly thick paste of laundry starch instead of the gelatin, and some workers prefer this method." (p313) But that's all it says, does anyone have any further info on this method of sizing? I work at a dry cleaners so I can take all the starch I need free.