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Formulate a Liquid that Loses its Color After Application

We are in the process of developing a new chemical for the home. In order to make the chemical easy to use, we'd like to create a water-based formula which is colorful when wet (applied), but dries quickly and fades to colorless. This will help consumers know where the product has been applied.

$1,000
top 10
28
submissions
DONE
22 months ago
Deliverables

Propose an ingredient we can use for this application. Submit:
1) The ingredient name/compound
2) Supplemental research or information to prove it fits the requirements (becomes colorless when dry)

Criteria:

The formulation has to be buffered at an acidic pH, between 4 and 5, for active ingredient stability. Any colorants used must have long term (2 year +) stability in solution.

Additional requirements: Low toxicity of the colorant and low to no odor.

Leaderboard
This challenge has received 28 submissions
Top 5 share $750 Next 5 share $250
$150.00 O University of California at Berkeley
$150.00 N Purdue University
$150.00 D Carnegie Mellon University
$150.00 M University of Wisconsin
$150.00 Square pic suyash pravin dhoot Indian Institute of Technology, Bombay
$50.00 Square pic screen shot 2015 02 28 at 6.04.45 pm Boston University
$50.00 T University of New Orleans
$50.00 S Queen's University
$50.00 Square pic 1233256 609851865704342 1523520549 o University of South Florida
$50.00 B University of Pennsylvania
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