Very 1st Lava Lamp

This was the 1st Lava Lamp I ever owned. It is a Midnight Series 8403 the has faded over time. The blue water has turn to a light yellow making the white lava look yellow in this pic but the lava is still white. I have toyed with recoloring the liquid to blue but then it would look similar to all the other blue & whites I have so I plan on leaving this unique color.