Strength and durability are very important properties in any polymer clay product. The amount of time and effort put into your project makes it very valuable; and when a piece breaks it can be very disappointing. Stronger than other clays, objects made with Kato Polyclay become permanent works of art that will resist breaking and wear over time. The recommended curing temperature for Kato Polyclay is between 275F (135C) and 300F (150C) for 10-30 minutes. TIP: Maximize the strength of Kato by curing at 300f (150C) - separate oven thermometer is recommended to ensure accuracy. There are 21 colours available in the Kato Polyclay line. 8 spectral colours, 5 neutral colours (including translucent), 4 metallic colours, 4 concentrated colours. All colours are intermixable, enabling the artist to create virtually any colour imaginable. This gives artists the freedom of producing their own signature colours. TIP: Adding White to any spectral colour will turn it into a Pastel! With other polymer clays, there is often a significant difference between the colour of the packaged clay and the clay after it has been cured. Kato Polyclay has a minimal colour shift when cured. TIP: When curing, create a "dome" or "tent" with aluminium foil over your work to help regulate temperatures and stabilize colours.