~Snip
To write wallet phrase codes, I personally do not use steel or titanium. But I just use plain paper. Because if you use paper it will be easier to hide or tuck anywhere. Unlike steel or titanium, it is certain that hiding it also requires a slightly larger space. Because steel or titanium is definitely very hard.
Therefore, I personally prefer paper to write down the wallet phrase code that I have. Because basically if it is stored in a dry and safe place, the paper containing the wallet phrase code will definitely be safe.
But writing wallet code phrases on paper also has a bit of risk too, if kept for a very long time. Like the paper could be eaten by termites, or the writing could become blurry because it's been around for too long. Therefore I have a way to overcome it. Namely, when writing wallet phrase codes, I use a pen that contains very good quality ink so that the writing lasts longer. I learned this method from my teacher who showed me his writing which was more than 40 years old, but the writing was still very clear and not blurry in the slightest. Then he told me that when he made the writing, he used a pen that had very good ink content.
And to deal with termites that often eat paper, this method is certainly known by many people. That is only need to buy anti-termite medicine. So even though I use paper to write the wallet phrase code that I have. But I am very confident that it will be very safe and will last a very long time. Apart from that, I personally have made a plan, that every five years I will rewrite the wallet phrase code that I have just in case and minimize the slightest risk.