Recreate a blue photo of the leaves Tatsuyama Botanical Garden's "Blue Sun Reveal" is full of fun

Original title: Recreate a blue photo for the leaves Chenshan Botanical Garden "Blue Sunshine Revealed" interesting

Oriental network reporter Bai Kelin reported on August 12: Mention the "blue sun", most people may be relatively unfamiliar, but when it comes to blue printed cloth, I believe that everyone can immediately think of the blue and white flower cloth hanging in the ancient town, simple and simple. Although the solvent of "blue sunning" is different from the blue printed cloth, the effect and process are similar. Recently, Chenshan Botanical Garden put this scientific experiment on the stage of the summer camp, allowing children to experience a rigorous and fun science experiment.

Blue sunning method is also called ferrocyanate printing method, the most commonly used name is blueprint printing method, first discovered by Sir John Herschel around 1841, many iron compounds can sense light, because its chemical composition and processing methods are very simple, and there are many uses, and it is popular with people. This basic printing method produces a white image with a blue midtone and shaded parts. Other colors can also be revealed, including blue images on a white background, and photographs can be made from negative or transparent positives on photo paper or cloth washed with starch paste, or on other materials.

The basic blue sunning method requires two stored solutions containing a certain percentage: 20% iron ammonium citrate solution and 10% potassium ferricyanide solution. Under the guidance of the science teacher, the children successfully configured the blue sunning reagent. Then select your favorite leaf, make a picture frame with a white background, use a small brush to dip the blue sunning reagent, evenly apply it to the bottom plate, and then put the photo paper in a dark place to dry. The camper then lays the leaves flat on photo paper, fixes them with transparent glue, shines in the sun for about 15 minutes, then removes the leaves and shakes them in clean water for a while. At this time, a magical moment appeared: the part covered by the leaves gradually faded, showing the white background of the photo paper, the outline of the leaves was clearly preserved on the photo paper, and the children cheered and loved their works.

Through simple scientific experiments, the "Reveal the Secret blue sun activity" not only let the children understand the ancient blue sun production methods, but also experienced the joy of artistic creation, each work is unique, and the children are also satisfied.

in Baklin