change the code in aray.c from

if (!r) {
int nr = create_part(-1, x+nxi+nxx, y+nyi+nyy, PT_BRAY);
if (nr!=-1) {
if (destroy) {//if it came from PSCN
parts[nr].tmp = 2;
parts[nr].life = 2;
} else
parts[nr].ctype = colored;
}
}

to

if (!r) {
int nr = create_part(-1, x+nxi+nxx, y+nyi+nyy, PT_BRAY);
if (nr!=-1) {
parts[nr].temp = parts[i].temp;
if (destroy) {//if it came from PSCN
parts[nr].tmp = 2;
parts[nr].life = 2;
} else
parts[nr].ctype = colored;
}
}

the difference being adding the line

parts[nr].temp = parts[i].temp;