Good Technique:
This group did a nice job of keeping the detergents within their respective wells. The row of 3 smaller wells with virtually no change were for plain water (control, center well), Woolite (top of picture between 2 & 6), and ALL (lower portion of picture between 3 & 5). There are no enzymes in either of those two detergents.
Bad Technique
This group was either careless with the drops or jostled the petri dish around after drops were in place. The enzyme action is all over the place, and no useful data can be gathered.
However, of the 15 pairs in my class, we had about 12 with good results, and consistently Tide & Cheer worked best on the gelatin. Don't know if that translates into better cleaning action on real stains with real clothing, but I will encourage the student from yesterday to pursue that angle of investigation.
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