How to Make Color-Changing Paint at Different Temperatures

Answer

Paint made of acrylic

Acrylic Medium (see craft stores)

Paste or powder containing thermochromic pigment (available online)

To apply, use the applicator (brush or roller)!!-!! Thermometer!!-!!!!-!!!!-!! Hairdryer

Stick for stirring!!!-!!! Bucket used for mixing!!!-!!! Keep in mind that the usual laws for colour mixing still apply; for instance, if yellow pigment is added to blue paint, the resultant paint will be green when heat is applied to the surface of the paint.

Do some comparison shopping online before purchasing pigment, whether you want it in paste or powder form. There are several manufacturers and retailers from which to choose, each providing a diverse selection of paint at a range of costs. Metallic paints may be purchased, but their cost is a little more than that of primary colours, which are always the most affordable option.

Be careful that it is very difficult to remove acrylic paint off fabrics and other surfaces after it has dried. It is strongly recommended that you carry out the mixing of your paint outside while wearing safety clothes. Keep in mind that you are also dealing with chemical compounds in addition to paint; thus, you should protect your hands by donning gloves and ensuring that you are working in an area that has enough ventilation.

Thermochromic paint is a kind of paint that alters its appearance in response to variations in temperature. The pigment molecules in the paint undergo a change in their compound structure as a result of the rise in temperature, which causes the paint to absorb or reflect light in a different manner. This results in the paint taking on a new hue. The majority of pigments undergo this colour shift at temperatures higher than 81 degrees Fahrenheit, and the colour reverts back to its original state when the pigment is cooled. The production of thermochromic paint may be accomplished in one of two ways: the first employs the use of liquid crystals, while the second makes use of leuco dyes mixed with chemical compounds. Because thermochromic paint is a relatively recent creation that calls for in-depth scientific understanding, the most effective method for producing thermochromic paint is to buy compounds that have already been prepared and mix them with paint.

Tip

In a mixing bucket, combine the necessary quantity of acrylic paint with an equal amount of acrylic medium; this ratio of about one part medium to 10 parts acrylic should be sufficient. Combine by stirring until it reaches a smooth consistency.

Stir together the thermochromic paste or powder, starting with only a tiny quantity (about 5 ml of paste or 1 teaspoon of powder).

Warning

Apply a test sample of paint on a scrap of material, and then let it dry completely.

Check the temperature with a thermometer after the test sample has been heated with a hairdryer to above 81 degrees Fahrenheit.

  1. If the combination does not undergo the colour change that is intended, add additional paste or powder to it, stir it, and then start the procedure again.

  2. After you have confirmed that the colour change in your test sample is accurate, you may go on to painting the target item. It is important to just apply one layer of paint and to avoid letting the previously painted parts dry up before continuing; otherwise, the colour transition will be uneven.

  3. Paint a test sample on a piece of scrap material: allow it to dry.

  4. Heat test sample to over 81ยบ F using a hairdryer; check the temperature with a thermometer.

  5. If the desired color change is not achieved, add more paste/powder to mixture; stir and repeat process.

  6. Once your test sample displays the correct color change, proceed to paint the designated object. Paint one coat, without allowing painted areas to dry before the remainder is completed; otherwise the color change will be uneven.