TintColor: Applies a multiplicative tint color to the texture pack. When a TintColor command is executed, it replaces any active Tint.
TintColor [r,g,b|delete] [transition] [player]
[r,g,b|delete] - The tint factor or 'delete' to remove the current tint.
Tints are multiplicative factors applied to the pixel colors on your screen. Each tint component is specified as a percentage. A percentage < 100 will reduce the corresponding color component in the pixel. A percentage > 100 will increase the color component, and a percentage of 100 will leave the corresponding color component of the pixel unchanged.
e.g. if you specify a tint of [50, 200, 25), and the pixel color is [128, 128, 128] (gray), then the final color will be [64, 256, 32] = which is a greenish tint with a small amount of red and even smaller amount of blue. The closer the tint value is to 100, the less effect (intensity) it has on the final color.
[transition] - The time to transition the tint on (fade it in), specified in milliseconds. If this parameter is omitted a default value of 3000 (3 seconds) is used. If a value of 0 (zero) is used, the transition is instant.
[player] - If this parameter is included, only the player who executed the script will see the tint, otherwise all players will see it.
There are some restrictions with dramatic rapid color changes in order to remove the possibility of seizure causing color changes.
TintColor [50, 200, 25]
The final color after this tint factor is applied will be 1/2 of the pixels red component, twice the green component, and 1/4 of the blue component, which will cause a mostly greenish tint for most colors. All players will see the tint. The tint will transition on over 3 seconds.
TintColor [150, 100, 100] [player]
The final color after this tint factor is applied will be 1.5 x the red component. The green and blue components remain unchanged. Only the player who executed the script will see the tint. The tint will transition on over 3 seconds.
TintColor [10, 0, 200] [player] 
The final color after this tint factor is applied is 1/10 of the red component, zero green component and twice the blue component which will usually cause a strong blue tint. Only the player who executed the script will see the tint. The tint will transition on over 2 seconds.
TintColor [delete] 
Removes the current tint. The tint will transition off over 1 second.",