Hi Angelina
In machine embroidery I have read of a product called topping – specifically “Floriani Embroidery Color Keep Topping” which enhances contrast colors. In hand embroidery the only thing that comes to my mind for your situation is to ensure that all the extra colour in your t-shirt is settled before you embroider on it. Wash it several times, washing it with salt solution to make the color settle, and then after embroidering, not washing it further with other colored clothes to reduce the probability of the color transferring on to the thread.
These posts may help : How to prevent color bleeding ; Garment and fabric care
Best wishes

I’ll be embroidering white and sometimes other light thread onto a black t-shirt and I want the threads to keep their vibrancy/colour after a dark wash.

I know a synthetic fibre would be best as they’re hard to dye but having difficulty finding these options in floss.

Looking forward to your insight,
Thanks!

Hi Jeanny
You mean plastic transparent bag? I am afraid I have not done that. One tip I can tell you is to use a very thin needle lest it leaves holes.

I would like to do some embroidery on my transparent bag. what would be the appropriate thread and needle to use?
Thank you for helping in advance.

Hi Elyse
Because of your comment I have added one more type of thread to the above list -thanks. I think you can have a look at Sashiko thread. I have added some details in the post.
I have no experience stitching on canvas but my common sense tells me to advice you not to use a too thick needle for the work; you will leave holes in canvas which may not mend as it would on normal fabrics.You can use thin needles with a large eye to accomodate the thicker thread you will be using. Hope this helps.

I am trying to work out a suitable thread for embroidering on a stretched canvas (typically used for painting). I am going to be threading along a single line, with no filling in. What would you recommend?

Thank you in advance.

Hi Nicky
Have you read this post on embroidering letters
About bleeding, it depends on the quality of embroidery thread you have – you can wash a piece of it and see if it will bleed. Most good quality thread do not bleed, in my experience. If you have a suspicion with dark colour you can set colors by washing the thread in salt solution or vinegar solution to set colours.

Usually a thin needle with a large eye is used for embroidering – because the embroidery floss ( 2 or 3 or more thread) has to go through the eye and the body should not be too thick that it will leave holes in your fabric. Read about sewing needles here. and best fabric for embroidery
Hope all this will help you
Best wishes

Hi Camille
Why don’t you embroider with regular polyester thread – it is compact and thin with some gloss and strong and no bleeding at all

Hi JSD
I think you might want to check out the lustrous Rayon thread (maybe labeled silk thread /artificial silk/art silk) – this is the one most people use for jewelry making, or very thin Nylon thread

Hoping you can help – i’m looking to include thread within my jewellery designs. And require something that is long-wearing, won’t fray, and holds it’s colour (if it can be custom dyed that’s a bonus too!). It also needs to be as fine/thin as possible!! I have been recommended silk/nylon but wondered if you had any suggestions.

(thank you in advance)

Hi Alyssa
Congrats on your first project and best wishes. If you buy a good quality thread (like DMC in US) usually they do not bleed. You can take some length and wash to see with very bright colours like red. some pre-wash thread in cold water with a little salt as a fixative.Some thread specifically come with this instruction – pre-soak all the floss in a mixture of water and vinegar to prevent the colors from running
Rayon embroidery thread may run so be careful if using that.