I have to both agree and disagree with Don. I don't think the sparklies are caused by undissolved grains of gelatin. I've let the gelatin bloom as long as overnight and still get them. My impression is that they are caused by the somewhat bubbly and viscous nature of the gelatin when it's dissolved and heated. I definitely agree that adding grain alcohol will help reduce or eliminate them. I add Everclear at a rate of about 15:1 gelatin solution to alcohol. I think this reduces the sparklies because the alcohol reduced the propensity of the gelatin to create bubbles and also reduces the viscosity a bit at the same time. I've used both 250 bloom gelatin as well as deionized ossein from B&S. I usually make the gelatin at a 3% or 4% strength for gum printing.