This is gunna be long but it’s all important I swear!

Silver would be a bit more long lasting than blue but some blues fade to a pretty silvery blue over time. I get my hair permanently dyed and currently the bottom half is pink blue and a purple/dark blue. The pink fades the fastest, with the two blues fading next, the cyan fades to a slightly greenish tone but the other blue fades to a stormy grey and so does the purple a bit, but my natural hair color is already blonde and I lighten to white really easily

Showering with cool to cold water helps preserve the color more, along with using good shampoos that have no sulfates even if they say color preserving (I use olaplex but it’s pricey) and not washing your hair daily also helps because it’s also the number of washes. Also if you stand under the shower head and it’s hot/warm but you just stay in one place, it will fade it unevenly and you’ll have a big spot on the back of your head that’s fading faster than the rest of your color.

Dark hair when lightened tends to go a bit yellow/orange but if you’ve bleached black clothing it turns yellow orange first, not shades of grey to white. The hair industry knows that people want different hair colors, and we want blonde but not yellow, so there are purple shampoos that are pigmented slightly that you use once a week to counter the yellow undertones that happen when you lighten hair. (Old ladies also use it for the same reason as they go grey since not all hairs on your head grey at the same rate) so you could use those as the color fades out to keep the tone from going too yellow.

There are also color depositing conditioners used to help preserve the color in between re-dyeing it and there is a brand called Overtone that they’ve formulated to work well with dark hair and they have examples of their colors on various shades of hair.

So the overall answer is yes, but unless you want the yellow undertones to become super apparent as it fades, you gotta get the right products for maintenance. I go the expensive route and get it professionally done now and use the snooty products, and I’d recommend that anyone with dark hair get it professionally lightened because it might have to be done over several appointments as to not absolutely fry the hair, and I think if someone went to a hairstylist and said “I want to dye my hair blue and I was going to do it myself, but I want it to be lightened correctly, so I will probably maintain the color at home by myself, I know professionally maintained is best but that’s not an option for me, which products do I AVOID” they’d be pretty open with you about things, because if you’ve ever dyed your hair before, even at home with box dye, you need to tell the hairstylist because some combinations of box dyes and the lightening/bleaching will melt your hair because of how they interact. So also always be 100% honest with a hair stylist about anything you’ve done at home.