I find many mistakes lice ENTITY not PARTICLE and wrong link.
No I understand that Praticles are only pointer laugh
Thx for the tip with the ambient=100;
now it´s works: the Particle is going be red
Code:
function exp_fade(ENTITY *p)
{
	p.alpha -= p.skill_b*time_step;
	p.blue -=p.skill_b*time_step;
	p.green -=p.skill_b*time_step;
	if (p.alpha <= 0)	p._LIFESPAN = 0;
}
function spriteraketeexpfunc(ENTITY* p){
	VECTOR vTemp;
	set(p,LIGHT); 
	p.ambient=100;  
	vec_randomize(vTemp,10);
	vec_add(p._VEL_X,vTemp);
	vec_set(p.blue,vector(0,0,0));
	set(p, _MOVE  | TRANSLUCENT);
	p.alpha = 100;
	p._SIZE = 2;
	p.skill_b=15;
	p._GRAVITY = 0.2;
	p._FADE = 1;  // fade factor
	p.event = exp_fade;	
}

soon my games on https://flindoflight.jimdosite.com/