Ingredients for black powder are relatively inert when unmixed. Years ago, sodium nitrate replaced saltpeter as the key ingredient in black blasting powder. This improved powder was developed by Lammot, grandson of the founder of the DuPont...
A man and five women in the exhibit. Written caption: "Dr. Norman Wilkinson - on far left. Hildegarde Rink - far right. Ruthanna Hindes - 3rd from right."
A woman and two men look at a diorama. Written caption: "L to R: John B. Riggs - EMHL MSS. Evald Rink - EMHL Cataloging. Polly Scafidi - Hagley Fellow." Another inscription on back identifies woman as Hildegard Rink.