First, prepare a box with a layer of desiccant (copper sulfate, available in general pharmacies and chemical reagent stores). Choose a sunny day, between 9- 10 in the morning, when the flowers are not exposed to dew, cut the blooming flowers, put them in a prepared box, put them on the desiccant, and then carefully pour a small amount of desiccant in to fill every gap between petals. Note that the gap between the petals of the original flower must be maintained to preserve the flower shape, which is a crucial step. Because some flowers, such as chrysanthemums, roses, azaleas, orchids, etc., have dense petals and small gaps in each layer, it is really not easy to fill them with desiccant without crushing the flower shape.

When the whole flower is completely surrounded by desiccant, cover the box and seal it with plastic bag and plastic tape. After a few days, it can be taken out (the number of days to seal the box depends on the thickness of the flower petals). At this time, the flowers are dry, brittle and easily broken. Be careful when taking them out. After taking them out, turn them upside down so that the desiccant between the flowers falls. After the desiccant is completely removed, the dried flower specimen is completed.

In order to prevent the dried flower specimen from absorbing moisture, it must be placed in a box with desiccant and sealed.

Method 2:

I. Principles

Some reducing chemicals can inhibit various oxidation factors; So as to control the oxidative decomposition of plant pigments and fix pigment molecules.

Second, the material

Stannous chloride, copper sulfate, sodium borohydride, sulfurous acid, formalin (37% ~ 40%), distilled water, specimen bottles, paraffin, glycerin, fresh flowers, etc.

Third, production

1, according to the ratio of 2g stannous chloride, 5g copper sulfate, 2g sodium borohydride, 5ml sulfurous acid and 95ml distilled water.

2, picking fresh flowers, it is best to choose those that are not fully open. After pruning, soak in the above-mentioned fixed solution for12 ~ 24 hours.

3, according to 95ml of distilled water, 5ml of formalin, 2 ~ 3 ml of sulfite to make preservation solution.

4. Take out the flowers treated with the fixed solution and immerse them in the specimen bottle containing the preservation solution. If the immersion liquid is insufficient, it can be supplemented until the flowers are completely immersed. After standing for 2 ~ 3 days, if color overflow is found, some glycerin or sodium chloride can be added appropriately; If the color is too dark, add some distilled water. This can maintain the balance of internal and external osmotic pressure of flowers and immersion liquid, and avoid deformation and discoloration of flowers. If there is no such phenomenon, it can be capped and sealed with paraffin.

By adopting the above method, the bright colors of flowers and the green of branches and leaves can be basically maintained at the same time; And can be kept for a long time. The specimen can be used for observation of teaching needs, and also for display and appreciation.