This is a note for reference if someone wants to recreate or optimize it. This is just a note and not a guide. it involves a lot of chemicals and they are dangerous. so experiment carfully.

1

For this one i am using the old Intel pentium processor. delidding in this case is simple and can be found here. ![Watch the video for delidding ]

2 i use this glass ethcing cream for delayering and it works

Before you do the delayering, silicon chip has a brownish layer and they are resistant to chemicals. i use a blowtorch to burn them away. it is a slow process. I use a bbq torch, so apply heat with distance to uniformly heat the die. Slowly your die will turn into silver with the top layer removed.

3

My ratio is 2:1 of the water+paste and dropping the die and leaving it for almost 3hr. I start checking right after 2.5hr to see if something bad happened.

4

These result might vary based on the metal layer and the size of the chip, so check the chip once in a while to see if something happens.

Note: NEVER HEAT THE CHIP AFTER CHEMICAL TREATMENT. It causes discoluration and breaks all the masks.

Here are some sample images.

5 6

Will add more as i learn more.