User login


Search Results


Showing results (1 to 2 of 2)

  • Thumbnail
    The Exploratorium
    Add to list Details
    Look at pictures through different color filters and you'll see them in a new way. People have used color filters in beautiful photography or sending secret messages.

    1 cent - $1 per student Ages 4 - adult 5 to 10 minutes
  • Thumbnail
    American Chemical Society
    Add to list Details
    In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases. Goldenrod paper is paper that has been dyed with natural...

    1 cent - $1 per student Ages 6 - 14 30 to 45 minutes