What is the reason why the color pigment cannot be cured after being added to the silicone?

What is the reason why the color pigment cannot be cured after being added to the silicone?
The color pigment cannot be cured after being added to the silicone, which may be caused by the following reasons:
Imbalance of proportion: Silicone is generally composed of two parts: base glue and curing agent. After adding the color pigment, the proportion of the components of the entire system may be changed. If too much color pigment is added, the effective concentration of the curing agent may be diluted, so that the curing agent is not enough to trigger the cross-linking reaction of the silicone, resulting in failure to cure. For example, the original correct ratio of silicone and curing agent is 10:1. After adding a large amount of color pigment, it is equivalent to changing the actual content of silicone, making the curing agent relatively insufficient and unable to complete the curing process.
color pigment component interference: Some color pigments may contain certain chemical components, which will react chemically with the curing system of silicone and inhibit the activity of the curing agent. For example, the color pigment may contain acidic or alkaline substances, and the curing system of silicone is more sensitive to pH. Acidic substances may neutralize the alkaline components in the curing agent, or alkaline substances may destroy the cross-linking structure of silicone and hinder the curing reaction.
Moisture influence: If the color pigment absorbs too much moisture during storage or use, when it is added to the silicone, the moisture will affect the curing reaction of the silicone. Moisture may react with the curing agent, consume the curing agent, or form a water film inside the silicone, hindering the cross-linking between silicone molecules, resulting in failure to cure. For example, when the color pigment is used in a humid environment, the color pigment is easy to absorb moisture in the air, which in turn affects the curing of the silicone.
Uneven mixing: After adding the color pigment, if it is not fully stirred, the silicone, curing agent and color pigment cannot fully contact and react, which will cause partial failure to cure or incomplete curing. In particular, some color pigments have a large viscosity and are difficult to fully mix with silicone, which is more likely to occur.
Unsuitable temperature and humidity: The curing process of silicone usually has certain requirements for ambient temperature and humidity. If the ambient temperature is too low, the curing reaction will slow down or even stop. When the humidity is too high, moisture may interfere with the curing reaction. For example, when the room temperature is lower than the suitable temperature range for silicone curing (generally 20℃-30℃), the curing time of silicone will be extended, and in severe cases it may not be cured.
Silicone or color pigment has expired and deteriorated: Silicone and color pigment have a certain shelf life. If the shelf life is exceeded, their chemical properties may change. The base glue and curing agent in the silicone may become ineffective, and the color pigment may also deteriorate, resulting in failure to cure normally after adding silicone. For example, if the silicone is stored for too long, the base glue may undergo oxidation, polymerization and other reactions, making it inactive.