High temperature refills Heat sensitive refill disappear refill pen erasable 35 oC 60 oC

High temperature disappeared for instructions:
1, This product temperature reached 60 degrees Celsius can disappear instantly.
2, Temporary line drawing for footwear, garment, leather tag to use.
3, Using high hardness steel head, improve the effect of tag, durable
4, White on dark leather, red, blue two colors to use on the light color leather