Anthocyanins are natural pigments which include many well known, there is abundant in plants and is the cause of the color orange, red, blue, and purple. In plants, anthocyanins found in flowers, fruit, and is soluble in water. The stability of anthocyanins is strongly influenced by physical and chemical factors such as pH, temperature, light (light), and oxygen as well as other factors such as enzymes and metals. In general, anthocyanins are more stable in acidic conditions, oxygen-free media and in cold temperatures and dark conditions.

This research was conducted using a randomized block design (RAK) factorial and simple with the 3 replication. The treatment used is heating 40oC for 15, 45, 60 minutes, the temperature of 80 0C for 15, 45, 60 minutes, the temperature of 100oC for 15, 45, 60 minutes, lighting the lamp 40 watt light bulb for 12, 24, 36 hours, 80 watts for 12, 24, 36 hours, 100 watts for 12, 24, 36 hours, ultra-violet light for 12, 24, 36 hours, giving the metal Al Cl3, Cl3 Fe. Parameters observed from each absorbance value is peralakuan (spectrophotometer UV λ 490-540 nm), intensity of color (color reader-10: L, a, b), and pH (pH meter).

The results showed that the heating treatment can decrease the value of absorbance, pH and color intensity. In the absorbance value S3H3 treatment decreased high of 0.57. In the pH value in the treatment S3H3 highest decline of 3.12. While the intensity of color on the L value (degree of brightness) S1H3 treatment experienced the highest decline of 33.3. On the value of a + (degree of redness) S1H2 treatment decreased the highest number of 15.4. At the value b + treatment S3H3 highest decrease of 6.4. Lighting lamp light bulb treatment can reduce the value of absorbance, pH, and color intensity (L +) and long interaction between treatment and the amount of lamp light bulb lighting is used. While the value of a + (degree of redness) and b + (degrees yellowish) showing no interaction between treatment and long light bulb lamp power irradiation of strawberry fruit pigment. But separate the two factors significantly. Ultra violet light treatment could raise the value of absorbance, pH, and color intensity (the value of a +) pigment strawberries. UV light for 36 hours showed the highest rate of increase in absorbance of 0.83, 3.39 pH value, color intensity (the value of a +), 24.5 and visually still appeared red. Treatment of metal additions (AlCl3 and FeCl3) was able to lower the absorbance value and color intensity (the value of a +) and treatment of the addition of Al lowers the value of absorbance of 0.81, the level of redness (the value of a +) 15.4 pH value 3.12. While the addition of Fe lowers the value of absorbance of 0.95, the level of redness (the value of a +) 13.55 with a pH value of 0.96.